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