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Report On Alumino Silcate: Sillimanite

265 words - 2 pages

Aluminosilicate Mineral ProfileMineral Name: SillimaniteChemical Formula: Al2SiO5Silicate Structural Class: NesosilicateDiagnostics Properties:Colour: White, Brown and GreenTransparency: Transparent to TranslucentLustre: Silky or VitreousSpecific Gravity: 3.2Streak: WhiteMohs Hardness: 7.5 in large crystalsMineral ...view middle of the document...

Sillimanite forms at high pressure (about 2.5 kilobars), Andalusite forms at higher temperatures but lower pressure (less than 2.5 kilobars) and Kyanite at high pressure (higher than 2.5 kilobars) but lower temperatures(3)Geographic Localities: Brazil, England and other European sitesMain Uses: Sillimanite is mainly used in the manufacture of spark plugs and other forms of ceramic insulation. It can be used as a gemstone although this is rare and is more often used as mineral specimens.Sillimanite: A compact chunk with obvious crystalline tendencies. Fibres are slightly curved and have a pearly lustre. (http://mineral.galleries.com/scripts/item.exe?ENLARGE+Minerals+Silicates+Sillimanite+SIL-1)

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