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