Aluminosilicate Mineral Profile Mineral Name: Sillimanite Chemical commandment: Al2SiO5 Silicate Structural Class: Nesosilicate Diagnostics Properties:         Colour: White, dark-brown and super acid Transparency: Transparent to Translucent Lustre: Silky or Vitreous         Specific Gravity: 3.2 Streak: White Mohs unmercifulness: 7.5 in large crystals         Mineral Cleavage: Perfect. Good in 1 direction lengthwise Occurrence:         Type of tremble: Aluminium-rich metamorphic rocks         Temperature: Forms at temperatures great than 550oC(2) Pressure Field: Sillimanite is a polymorph with two other minerals: cyanite and Andalusite. Sillimanite forms at high squash (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 cut back temperatures(3) Â Â Â Â Â Â Â Â Geographic Localities: Brazil, England and other European sites Main Uses: Sillimanite is mainly enforce in the manufacture of spark plugs and other forms of ceramic insulation. It force out be used as a gemstone although this is expansive and is more often used as mineral specimens. Sillimanite: A compact chunk with obvious crystalline tendencies. Fibres are precisely about curved and have a pearly lustre. (http://mineral.galleries.com/scripts/item.exe? set off+Minerals+Silicates+Sillimanite+SIL-1) If you demand to get a full essay, order it on our website:
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