Report on Alumino Silcate: Sillimanite
Title: Report on Alumino Silcate: Sillimanite
Category: /Society & Culture/Geography
Details: Words: 205 | Pages: 1 (approximately 235 words/page)
Report on Alumino Silcate: Sillimanite
Category: /Society & Culture/Geography
Details: Words: 205 | Pages: 1 (approximately 235 words/page)
Aluminosilicate Mineral Profile
Mineral Name: Sillimanite
Chemical Formula: Al2SiO5
Silicate Structural Class: Nesosilicate
Diagnostics Properties:
<Tab/>
Colour: White, Brown and Green
Transparency: Transparent to Translucent
Lustre: Silky or Vitreous
<Tab/>Specific Gravity: 3.2
Streak: White
Mohs Hardness: 7.5 in large crystals
<Tab/>Mineral Cleavage: Perfect. Good in 1 direction lengthwise
Occurrence:
<Tab/>
Type of Rock: Aluminium-rich metamorphic rocks
<Tab/&
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gt;Geographic Localities: Brazil, England and other European sites
Main Uses: Sillimanite is mainly used in the manufacture of spark plugs and other forms of ceramic insulation. It can be used as a gemstone although this is rare and is more often used as mineral specimens.
Sillimanite: A compact chunk with obvious crystalline tendencies. Fibres are slightly curved and have a pearly lustre. (http://mineral.galleries.com/scripts/item.exe?ENLARGE+Minerals+Silicates+Sillimanite+SIL-1)