Infobox mineral name Kyanite category Silicate mineral boxwidth boxbgcolor image Kyanite crystals.jpg ... ref Kyanite , whose name derives from the Greek word kuanos sometimes referred to as kyanos , meaning ... pegmatite s and or sedimentary rock . Kyanite in metamorphic rocks generally indicates pressures higher ... such as muscovite , pyrophyllite , or kaolinite . Kyanite is also known as disthene, rhaeticite and cyanite. Kyanite is a member of the aluminosilicate series, which also includes the Polymorphism materials science polymorph andalusite and the polymorph sillimanite . Kyanite is strongly anisotropy ... direction. In Kyanite, this anisotropism can be considered an identifying characteristic. At temperatures above 1100 C kyanite Chemical decomposition decomposes into mullite and Fused quartz ... ref Uses of kyaniteKyanite is used primarily in refractory and ceramic products, including porcelain ... insulators and abrasives . Kyanite has been used as a semiprecious gemstone , which may display ... include recently discovered orange kyanite from Tanzania. citation needed date June 2011 The orange .... Gaft, et.al., Laser induced time resolved luminescence of orange kyanite Al sub 2 sub SiO sub 5 sub , http www.sciencedirect.com science article pii S0925346711002138 ref Kyanite is one of the index .... Notes for identification Image Kyanite.JPG thumb left Deep blue kyaniteKyanite s elongated ... materials science polymorphs of staurolite , which occur frequently with kyanite. However, the most useful characteristic in identifying kyanite is its anisotropism. If one suspects a specimen to be kyanite, verifying that it has two distinctly different hardnesses on perpendicular axes is a key to identification. Occurrence Kyanite occurs in gneiss , schist , pegmatite , and quartz Vein geology ... References commons category Kyanite reflist http mineral.galleries.com minerals silicate kyanite ... title On the origin of colour and pleochroism of kyanite journal The Canadian Mineralogist volume ... more details
Infobox mountain name Willis Mountain photo photo caption elevation m 304 elevation ref prominence convert 170 m ft 1 abbr on prominence ref listing location Buckingham County, Virginia Buckingham County , Virginia range coordinates coord 37 28.3439 N 78 27.4920 W type mountain region US display inline,title topo type age first ascent easiest route Willis Mountain is a monadnock rising from the rolling Piedmont United States Piedmont hills of Buckingham County, Virginia, near the geographic center of the state. It is composed of Kyanite bearing quartz that weathers more slowly than the surrounding material. ref name wm cite web url http web.wm.edu geology virginia provinces piedmont willis mountain.html title Willis Mountain publisher College of William & Mary Department of Geology accessdate 2009 03 08 quote Composed of kyanite bearing quartzite, Willis Mountain stands more resistant to the forces of weathering ref The Kyanite Mining Corporation of Dillwyn, Virginia Dillwyn has mined Willis Mountain long enough to reduce significantly the profile of the mountain. ref name wm ref name kmc cite web url http www.kyanite.com assets Generations.pdf title Looking Beyond the Mountain format PDF accessdate 2009 03 08 quote T he company that now mines the Willis deposit got its start only 60 years after Robert E. Lee surrendered his confederate forces to Ulysses S. Grant at the Court House in Appomattox ref References reflist External links gnis 1476784 The Priest http www.nvcc.edu home cbentley geoblog 2008 10 kyanite mining at willis mountain.html Northern Virginia Community College Kyanite Mining at Willis Mountain, Virginia Category Monadnocks Category Mountains of Virginia Category Geography of Buckingham County, Virginia BuckinghamVA geo stub ... more details
An index mineral is used in geology to determine the degree of metamorphism a rock has experienced. Depending on the original composition of and the pressure and temperature experienced by the protolith parent rock , chemical reactions between minerals in the solid state produce new minerals. When an index mineral is found in a metamorphosed rock, it indicates the minimum pressure and temperature the protolith must have achieved in order for that mineral to form. The higher the pressure and temperature in which the rock formed, the higher the Metamorphic grade grade of the rock. The concept traces its roots to 1912, when George Barrow geologist G. M. Barrow mapped Metamorphic zone zones of metamorphism in southern Scotland . Each zone is named for the index mineral that appears in it. E.g. the chlorite zone is named for Chlorite group chlorite . Mineralogic zones Mudrock , a fine grained sedimentary rock often containing aluminium rich minerals, produces these minerals after being metamorphosed, from low to high grade ref Blatt, Harvey and Robert J. Tracy, Petrology, Freeman, 1996, 2nd ed., p. 375 ISBN 0 7167 2438 3 ref Chlorite group Chlorite zone quartz, chlorite, muscovite, albite Biotite Biotite zone quartz, muscovite, biotite, chlorite, albite Garnet Garnet zone quartz, muscovite, biotite, garnet, Na plagioclase Staurolite Staurolite zone quartz, muscovite, biotite, garnet, staurolite, plagioclase Kyanite Kyanite zone quartz, muscovite, biotite, garnet, kyanite, plagioclase, staurolite Sillimanite Silimanite zone quartz, muscovite, biotite, garnet, sillimanite, plagioclase See also Metamorphic facies Metamorphic zone Index fossil References Reflist Marshak, Stephen. Earth Portrait of a Planet, Norton, 3rd ed. 2007 ISBN 978 0393930368 Category Mineralogy Category Metamorphic petrology petrology stub he ... more details
merge aluminium silicate date October 2011 al2sio5 phase diagram Aluminosilicate mineral s are minerals composed of aluminium , silicon , and oxygen , plus countercations. They are a major component of kaolin and other clay mineral s. Andalusite , kyanite , and sillimanite are naturally occurring aluminosilicate minerals that have the composition aluminium Al sub 2 sub silicon Si oxygen O sub 5 sub . ref http rruff.geo.arizona.edu doclib hom andalusite.pdf Andalusite, Handbook of Mineralogy ref ref http rruff.geo.arizona.edu doclib hom kyanite.pdf Kyanite, Handbook of Mineralogy ref ref http rruff.geo.arizona.edu doclib hom sillimanite.pdf Sillimanite, Handbook of Mineralogy ref The triple point of the three Polymorphism materials science polymorphs is located at a temperature of 500 C and a pressure of 0.4 GPa. These three minerals are commonly used as index mineral s in metamorphic rock s. Hydrated aluminosilicate minerals are referred to as zeolite s and are porous structures that are naturally occurring materials. The catalyst amorphous silica alumina silica alumina is an amorphous substance which is not an aluminosilicate compound. See also Aluminium silicate Silicate minerals Calcium aluminosilicate Sodium aluminosilicate References reflist mineral stub Category Aluminosilicates Category Glass compositions Category Nesosilicates ca Aluminosilicat de Alumosilicate et Alumosilikaadid es Aluminosilicato eu Aluminio silikato fr Aluminosilicate kk hu Alum nium szilik t nl Aluminosilicaat ja no Aluminiumsilikat pl Glinokrzemiany ru uk ... more details
This is a list of minerals, both metallic and non metallic. Metallic Aluminium Antimony Arsenic Chromite Coal Copper Dolomite Gold Iron ore Fire clay Fluorite Glass sand Garnet Granite Graphite Gypsum Lead Magnesite Manganese Tungsten Zinc Non Metallic Asbestos Barite Brine Calcite Cinnabar Kaolinite Kaolin Kyanite Lignite Limenite Limestone Marble Mica Rock phosphate Potash Pyrite Quartz Radioactive minerals Halite Rock salt Sand Silica sand Soapstone Sulphur Vermiculite Vesuvianite Zircon See also Pakistan Mineral Development Corporation PMDC References Encyclopedia of Pakistan by Zahid Hussain Anjum , Jahangir Book Depot, Pakistan 2005 2006 Category Pakistan related lists Minerals of Pakistann ... more details
A metamorphic reaction is a chemical reaction that takes place during the geological process of metamorphism wherein one assemblage of minerals is transformed into a second assemblage which is stable under the new temperature pressure conditions resulting in the final stable state of the observed metamorphic rock . ref cite web url http www.tulane.edu sanelson eens212 metamorphreact.htm title Types of Metamorphic Reactions publisher Tulane University accessdate 2007 06 22 ref Examples would include the production of talc under varied metamorphic conditions serpentine group serpentine carbon dioxide talc magnesite water chlorite group chlorite quartz kyanite talc water See also Index mineral Notes references Category Metamorphic petrology Category Geological processes Category Reaction mechanisms Category Thermochemistry petrology stub it Reazioni metamorfiche ... more details
kyanite and garnet &ndash staurolite &ndash kyanite . ref name John cite journal last John first ... quartz talc kyanite, which has been used to define the stability of the whiteschist assemblage ... feldspar plagioclase kyanite talc quartz Fe hematite Na, Ca, K, Mn fluid has been described from ... stability range of the kyanite talc assemblage under high oxygen fugacity conditions. ref name ... more details
File Kyanite 201678.jpg thumb upright Kyanite specimen mined near Sultan Hamud Sultan Hamud is a town in Kasikeu division of Nzaui District of Eastern Province Kenya Eastern Province , Kenya . It is part of Nzaui County Council and Kilome Constituency ref Electoral Commission of Kenya http www.eck.or.ke downloads pollingcentres.pdf Registration centres by electoral area and constituency ref . . Transport It lies on the main railway line of Kenya Railways between the coast at Mombasa and the national capital of Nairobi . It is also a junction for a short branch line. See also Railway stations in Kenya References Reflist External links coord 02 01 00 S 37 22 00 E region KE type city display title http maps.msn.com 28pexpk545yztsuy55mg4jnq45 29 map.aspx?lats1 2.016667&lons1 37.366667&alts1 14®n1 2 MSN Map Commons category Minerals of Sultan Hamud position left Category Populated places in Eastern Province Kenya sw Sultan Hamud ... more details
Unreferenced date December 2009 Mineral hydration is an inorganic chemical reaction where water is added to the crystal structure of a mineral , usually creating a new mineral, usually called a hydrate . In geology geological terms, the process of mineral hydration is known as retrograde alteration and is a process occurring in retrograde metamorphism . It commonly accompanies metasomatism and is often a feature of wall rock alteration around ore bodies. Hydration of minerals occurs generally in concert with hydrothermal circulation which may be driven by tectonic or igneous activity. Mineral hydration is also a process in the regolith that results in conversion of silicate minerals into clay minerals. There are two main ways in which minerals hydrate. One is conversion of an oxide to a double hydroxide , as with the hydration of calcium oxide CaO to calcium hydroxide Ca OH sub 2 sub , the other is with the incorporation of water molecules directly into the crystalline structure of a new mineral, as in the hydration of feldspar s to clay mineral s, garnet to Chlorite group chlorite or kyanite to muscovite . Some mineral structures, for example, montmorillonite , are capable of including a variable amount of water without significant change to the mineral structure. Hydration is the mechanism by which Portland cement develops strength. See also Metasomatism Metamorphism Hydrothermal circulation Category Geology Category Concrete Category Inorganic reactions Category Hydrates he it Idratazione minerale es Hidrataci n mineral ... more details
orphan date December 2009 Daniel Smith Art Supply sometimes advertised as Daniel Smith Artists Materials is an art supply manufacturer and retailer. Dan Smith, a noted printmaking artist, founded the operation in 1976, endeavoring to produce artist grade printmaking ink. Later, watercolor paint , oil paint and acrylic paint lines were added to the proprietary selection. Daniel Smith s paint manufacturing facility is located in Seattle, Washington , where it mills pigments and mixes the final paint product. The company characterizes its paints as professional artist grade. One of the unique approaches to paint that the company focuses on is the use of pigments derived from semi precious minerals and other unique geological deposits. Among their collection of so called PrimaTek colors are paints derived from turquoise , lapis lazuli , rhodonite , kyanite and serpentine group serpentine . Daniel Smith Art Supply distributes their art supply catalog quarterly, which includes commissioned artwork and educations articles. External links http www.danielsmith.com Daniel Smith Art Supply web site Category Art materials brands Category Online retail companies of the United States Category Mail order retailers Category Retail companies of the United States Category Companies established in 1976 Category Companies based in Seattle, Washington US retail company stub ... more details
NOTOC In geology, an isograd is a plane of constant metamorphic grade in the field it separates metamorphic zone s of different metamorphic index mineral s. ref Best 2003 , p 435 Philpotts 1990 , p 317 ref On geologic map s focusing on metamorphic terranes or landscapes underlain by metamorphic rocks , the boundaries between rocks of different metamorphic grade are commonly demarcated by isograd lines. The garnet isograd, for example, would mark the first occurrence of garnet in the rocks. The mineral s present in a metamorphic rock are important because laboratory experiments at high pressures and temperatures have provided a lot of information on the pressure and temperature conditions under which certain metamorphic minerals form. For example, with increasing temperature and pressure the first minerals to form from a shale are mica s, particularly chlorite and biotite . With increasing temperature and pressure garnet appears, and then kyanite at relatively high pressure or sillimanite at relatively high temperature . The metamorphic zone with chlorite can be referred to as the chlorite zone , the zone with garnet as garnet zone , and so forth. To communicate this easily, the dominant metamorphic minerals in schist s are usually included in the name, as, for example, garnet schist, or garnet staurolite schist, and so forth. See also Metamorphism Metamorphic facies Notes references Literature aut Best, M.G. 2003 Igneous and Metamorphic Petrology , Blackwell Publishing 2nd ed. , ISBN 978 1 4051 0588 0. aut Philpotts, A.R. 1990 Principles of Igneous and Metamorphic Petrology , Prentice Hall, ISBN 0 13 691361 X. Category Geology petrology stub nn Isograd ... more details
Infobox settlement native name my official name Mohnyin Township settlement type Townships of Burma Township image skyline image map map caption pushpin label position bottom pushpin map Burma pushpin map caption Location in Burma coordinates display inline,title coordinates region MM 11 subdivision type Country subdivision name flag Burma subdivision type1 Administrative divisions of Burma State subdivision name1 Kachin State subdivision type2 Districts of Burma District subdivision name2 Mohnyin District subdivision type3 Capital subdivision name3 Mohnyin unit pref Metric area total km2 population population as of population density km2 auto latNS N latd 24 latm 47 lats longEW E longd 96 longm 22 longs elevation m timezone Myanmar Standard Time MST utc offset 6 30 website Mohnyin Township ref name MIMU001 http www.burmalibrary.org docs6 MIMU001 A3 SD 20& 20Township 20Overview.pdf Myanmar States Divisions & Townships Overview Map Myanmar Information Management Unit MIMU ref lang my also Kamaing Township is a Townships of Burma township of Mohnyin District in the Kachin State of Burma Burma Myanmar . ref http www.mrtv3.net.mm open7 070210for1.html Developing Kachin State with peace, unity and pleasantness MRTV3 ref The principal town and administrative centre is Mohnyin . Jade and gem quality kyanite ref Staff Gem News International Kyanite from Mohnyin Township Gems & Gemology 45 1 pp. 59& 151 75, pages 68& 151 69 ref are produced in Mohnyin Township, as well as amber , gold, asafoetida , and jasper . ref Golden Jubilee Publication Committee 2005 Myanmar Historical Commission conference proceedings 12 14 January 2005 volume 3, Myanmar Historical Commission, Ministry of Education, Yangon, Myanmar, page 69, http www.worldcat.org oclc 63241287 OCLC 63241287 ref Indawgyi Lake Wildlife Sanctuary is located in the central north of the township. Notes Reflist External links http www.maplandia.com burma kachin mohnyin Mohnyin Google Satellite Map map ... more details
Image MinasGerais Municip CoronelMurta.svg thumb right 250px Location of Coronel Murta in the state of Minas Gerais File Kyanite Quartz 57258.jpg thumb Intense blue Kyanite from Barra de Salinas mining district, Coronel Murta. Coronel Murta is a Brazilian municipality located in the northeast of the state of Minas Gerais . Its population as of 2007 was estimated to be 9,120 people living in a total area of 813 km . The city belongs to the mesoregion of Jequitinhonha and to the microregion of Ara ua . It became a municipality in 1953. Coronel Murta is located on the left bank of the Jequitinhonha River at an elevation of 322 meters. The climate is semi arid. The region is one of the most impoverished in the country. The economy is based on cattle raising, services, and subsistence agriculture, with the main crops being beans, sugarcane, and corn. The cattle herd had 11,000 head in 2006. In 2005 there were 770 rural producers but only 14 tractors. 2,500 persons were dependent on agriculture. As of 2005 there were 5 public health clinics. Educational needs were met by 10 primary schools, 1 middle school and 1 nursery school. There were 191 automobiles in 2006, giving a ratio of 47 inhabitants per automobile there were 403 motorcycles . There was 1 bank in 2007. ref http www.ibge.gov.br cidadesat default.php IBGE ref Neighboring municipalities are Rubelita Ara ua Virgem da Lapa . The distance to Belo Horizonte is 714 km. The distance to the nearest major population center, Ara ua is 30 km. ref http www.aondefica.com centerleft mg.asp Distancias Minas Gerais ref ref http www.citybrazil.com.br mg regioes aracuai Citybrazil ref Social Indicators Coronel Murta is ranked low on the MHDI and was one of the poorest municipalities in the state and in the country in 2000. MHDI .673 2000 State ranking 663 out of 853 municipalities National ranking 3,413 out of 5,138 municipalities in 2000 Life expectancy 67 Literacy rate 76 Combined primary, secondary and tertiary gross enrolm ... more details
merge aluminosilicate date October 2011 Chembox Verifiedfields changed verifiedrevid 457807899 Section1 Chembox Identifiers PubChem 10313254 PubChem Ref Pubchemcite correct Pubchem ChemSpiderID 8488719 ChemSpiderID Ref chemspidercite changed chemspider SMILES O Al O Si O O Al O StdInChI 1S 2Al.O3Si.2O c 1 4 2 3 q2 1 2 StdInChI Ref stdinchicite changed chemspider StdInChIKey PZZYQPZGQPZBDN UHFFFAOYSA N StdInChIKey Ref stdinchicite changed chemspider Section2 Chembox Properties Formula Chem Al 2 SiO 5 MolarMass 162.0456 g mol sup 1 sup ExactMass 161.914576525 g mol sup 1 sup Aluminium silicate or aluminum silicate has the chemical formula AlO sub 2 sub SiO sub 3 sub . It has a density of 2.8 to 2.9 g cm , a vitreous lustre, a refractive index of 1.56, a Mohs hardness of 4.5 7.5 depending upon structure , and can have orthorhombic crystallography. ref cite web url http www.reade.com en Products Minerals and Ores Aluminum Silicate Powder.html title Reade Advanced Materials offers Aluminum Silicate Powder accessdate 2006 11 16 ref It is insoluble and used as a refractory in glass production glassmaking . Minerals composed of aluminium silicate include Andalusite Sillimanite or Bucholzite Kyanite These all have the same chemical composition but are Polymorphism materials science polymorphic , having different crystalline structures. Aluminium silicate is considered to be fireproof for the purposes of building and insulation. See also Aluminosilicate References references External links http www.science.uwaterloo.ca cchieh cact applychem alsilicate.html Aluminum Silicates Aluminium compounds Category Aluminium compounds Category Silicates Category Orthorhombic minerals mineral stub hu Alum nium szilik t no Aluminiumsilikat ru sr Aluminijum silikat ... more details
and kyanite . A common variety of sillimanite is known as fibrolite , so named because the mineral ... rocks include gneiss and granulite . It occurs with andalusite, kyanite, potassium feldspar ... more details
Infobox mountain name Henry s Knob photo photo caption elevation ft 1129 elevation ref ref cite gnis id 1245958 name Henry Knob ref prominence location York County, South Carolina York County , South Carolina South Carolina, USA range None lat d 35.1309688 long d 81.2742443 region US SC source GNIS topo United States Geological Survey USGS King s Mountain, NC first ascent easiest route Henry s Knob is a mountain and Superfund Alternative Site in York County, South Carolina York County South Carolina at convert 1120 ft m abbr on above sea level. It is near the North Carolina border and the town of Clover, South Carolina . The mountain was the site of an open pit kyanite mine, which was under operation from 1947 to 1970. At the time of its discovery, the deposit of kyanite on the mountain was the world s largest ref http www.hiltonpond.org ArticleMineralsSCMain.html. ref United States Environmental Protection Agency EPA testing has determined that approximately 450 residences in the vicinity relying on well water are affected by groundwater contamination from the former mine. ref http www.epa.gov Region4 waste npl nplsc henryknobsc.htm ref The mountain was stripped of approximately convert 100 ft m due to the mining operations. ref http www.hiltonpond.org ArticleMineralsSCMain.html ref Today, the site is overgrown, with many pits and waste ponds still evident. While some efforts have been made to repopulate the site with vegetation, little cleanup of the dangerous minerals including Manganese has been done. ref http www.epa.gov Region4 waste npl nplsc henryknobsc.htm ref History ref http www.henrysknobenvironmentalforum.com faq ref Henry s Knob name derives from the Henry family, early settlers of York County who originally owned the mountain and surrounding land. In 1765 William Henry was granted convert 336 acre km2 on the south side of the Little Mountain, as Henry s Knob was then called, and four years later he was granted another convert 100 acre km2 . At this ti ... more details
Al sub 2 sub SiO sub 5 sub , all are nesosilicate s . Andalusite is stable at low pressure, kyanite ... , kyanite sillimanite In Si dolostones dolomite calcite tremolite talc lower pressure and temperature ... assemblages In metabasites omphacite garnet kyanite , quartz , hornblende , zoisite In metagranodiorite quartz phengite jadeite omphacite garnet In metapelites phengite garnet kyanite chloritoid Mg rich quartz phengite kyanite talc quartz jadeite Albite epidote hornfels facies LP LT MT The albite ... more details
occurs in phyllite and schist ose rocks, often associated with kyanite , of which it is an alteration product. It also occurs as hydrothermal deposits. Typical associated minerals include kyanite ... more details
Infobox Rockunit name Wissahickon Formation image CZw.jpg type Geological formation prilithology Schist otherlithology Gneiss and Quartzite namedfor The Wissahickon Creek namedby region Piedmont United States Piedmont of eastern North America coordinates caption A hand sample of the type Wissahickon from the banks of the Wissahickon Creek unitof none subunits Mt. Cuba, Doe Run schist, Laurels schist, Greystone schist thickness unknown extent Southeastern Pennsylvania, northern Delaware, Northeastern Maryland age Ediacaran to Early Cambrian Depositional The Wissahickon Formation is a mapped bedrock unit in Pennsylvania , New Jersey , and Delaware . In Maryland , the term Wissahickon is no longer used and has since been divided into several units. ref http www.mgs.md.gov esic geo lgepm.html Geologic Maps of Maryland Eastern Piedmont Metasedimentary Rocks Bot generated title ref It is named for the Wissahickon gorge in Fairmount Park , Philadelphia . Description The Wissahickon is described as a Pelite pelitic schist and gneiss with interlayers of quartzite . Color is highly variable as is the mineralogy . ref name multiple Blackmer, G.C., 2005 . Preliminary Bedrock Geologic Map of a Portion of the Wilmington 30 by 60 Minute Quadrangle, Southeastern Pennsylvania. Pennsylvania Geologic Survey, Open File Report OFBM 05 01.0. ref A general description for the unit is described as a silver to brown garnet mica schist. Metamorphic grade The highly variable nature of this rock type is also why the metamorphism Metamorphic grades metamorphic grade is also complex. The existence of the minerals biotite , garnet , staurolite , and kyanite all imply a low intermediate to high metamorphic grade. The metamorphic facies , which is described as lower to upper amphibolite facies, implies a moderate to high metamorphic temperature and a moderate pressure. Age Depositional age The age indicated on the most recent geologic map of southeast Pennsylvania shows the Wissahickon being Ediaca ... more details
dablink This article is about the terminology used to describe fracture surfaces. For fractures in rocks and minerals per se , see Fracture geology In the field of mineralogy , fracture is a term used to describe the shape and texture of the surface formed when a mineral is fracture fractured . Minerals often have a highly distinctive fracture, making it a principal feature used in their identification. Fracture differs from Cleavage crystal cleavage in that the latter involves clean splitting along the cleavage planes of the mineral s crystal structure , as opposed to more general breakage. All minerals exhibit fracture, but when very strong cleavage is present, it can be difficult to see. Terminology Conchoidal fracture Image ObsidianOregon.jpg thumb left 180px Obsidian Conchoidal fracture is a curved breakage that resembles the concentric ripples of a mussel shell. It often occurs in amorphous or fine grained minerals such as flint , opal or obsidian , but may also occur in crystalline minerals such as quartz . Subconchoidal fracture is similar to conchoidal fracture, but not as curved. br clear all Earthy fracture Image Limonite bog iron cm02.jpg thumb left 180px Limonite Earthy fracture is reminiscent of freshly broken soil . It is frequently seen in relatively soft, loosely bound minerals, such as limonite , kaolinite and aluminite . br clear all Hackly fracture Image Cuivre natif1 USA .jpg thumb left 180px Native copper Hackly fracture also known as jagged fracture is jagged, sharp and uneven. It occurs when metals are torn, and so is often encountered in native metal s such as Native copper copper and silver . br clear all Splintery fracture Image Chrysotile 1.jpg thumb left 180px Chrysotile Splintery fracture comprises sharp elongated points. It is particularly seen in fibrous minerals such as chrysotile , but may also occur in non fibrous minerals such as kyanite . br clear all Uneven fracture Image MagnetitaEZ.jpg thumb left 180px Magnetite Uneven fractur ... more details
Infobox mineral name Gedrite category Inosilicate boxwidth boxbgcolor image caption formula Mg Fe sup 2 sup sub 2 sub Mg Fe sup 2 sup sub 3 sub Al sub 2 sub Si sub 6 sub Al sub 2 sub O sub 22 sub OH sub 2 sub symmetry Orthorhombic 2 m 2 m 2 m unit cell a 18.59 , b 17.89 , c 5.3 Z 4 color White, gray, brown, green habit Bladed and prismatic crystals fibrous and sheath like aggregates. system Orthorhombic twinning cleavage 56 and 126 good 210 perfect fracture Splintery mohs 5.5 6 luster Vitreous to silky refractive n sub sub 1.671 n sub sub 1.681 n sub sub 1.690 opticalprop Biaxial birefringence 0.019 pleochroism Weak to moderate 2V Measured 75 streak gravity 3.18 3.33 density melt fusibility diagnostic solubility diaphaneity Translucent, will transmit light on thin edges. other references ref name Handbook http www.handbookofmineralogy.org pdfs gedrite.pdf Handbook of Mineralogy ref ref name Webmin http webmineral.com data Gedrite.shtml Webmineral ref ref http www.mindat.org min 1665.html Mindat ref Gedrite is a silicate mineral of the amphibole group with formula Mg Fe sup 2 sup sub 2 sub Mg Fe sup 2 sup sub 3 sub Al sub 2 sub Si sub 6 sub Al sub 2 sub O sub 22 sub OH sub 2 sub . Gedrite occurs in Contact metamorphism contact and medium to high grade metamorphic rock s in association with garnet , cordierite , anthophyllite , cummingtonite , sapphirine , sillimanite , kyanite , quartz , staurolite and biotite . ref name Handbook Gedrite was first described for an occurrence in Gedres, France in 1836. ref name Webmin References Reflist Category Amphibole group Category Orthorhombic minerals silicate mineral stub it Gedrite ja pl Gedryt uk ... more details
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