Aluminosilicate Mineral Profile Mineral Name: Sillimanite Chemical expression: Al2SiO5 Silicate Structural Class: Nesosilicate Diagnostics Properties:         Colour: White, dark-brown and color Transparency: Transparent to Translucent Lustre: Silky or Vitreous         Specific Gravity: 3.2 Streak: White Mohs severeness: 7.5 in large crystals         Mineral Cleavage: Perfect. Good in 1 direction lengthwise Occurrence:         Type of gemstone: Aluminium-rich metamorphic rocks         Temperature: Forms at temperatures great than 550oC(2) Pressure Field: Sillimanite is a polymorph with two other minerals: kyanite and Andalusite. Sillimanite forms at high insistency (about 2.5 kilobars), Andalusite forms at higher temperatures further humiliate pressure (less than 2.5 kilobars) and Kyanite at high pressure (higher than 2.
5 kilobars) but overturn temperatures(3) Â Â Â Â Â Â Â Â Geographic Localities: Brazil, England and other European sites Main Uses: Sillimanite is mainly usage in the manufacture of spark plugs and other forms of ceramic insulation. It residuum be used as a gemstone although this is steep and is more often used as mineral specimens. Sillimanite: A compact chunk with obvious crystalline tendencies. Fibres are that about curved and have a pearly lustre. (http://mineral.galleries.com/scripts/item.exe? embroider+Minerals+Silicates+Sillimanite+SIL-1) If you demand to get a full essay, order it on our website:
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