Aluminosilicate Mineral Profile Mineral Name: Sillimanite Chemical shape: Al2SiO5 Silicate Structural Class: Nesosilicate Diagnostics Properties:         Colour: White, dark-brown and parking lot Transparency: Transparent to Translucent Lustre: Silky or Vitreous         Specific Gravity: 3.2 Streak: White Mohs cruelness: 7.5 in large crystals         Mineral Cleavage: Perfect. Good in 1 direction lengthwise Occurrence:         Type of disputation: 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 impel (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 turn down temperatures(3) Â Â Â Â Â Â Â Â Geographic Localities: Brazil, England and other European sites Main Uses: Sillimanite is mainly plight in the manufacture of spark plugs and other forms of ceramic insulation. It revoke be used as a gemstone although this is proclaim and is more often used as mineral specimens. Sillimanite: A compact chunk with obvious crystalline tendencies. Fibres are clean about curved and have a pearly lustre. (http://mineral.galleries.com/scripts/item.exe? lucubrate+Minerals+Silicates+Sillimanite+SIL-1) If you demand to get a full essay, order it on our website:
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