Aluminosilicate Mineral Profile
Mineral Name: Sillimanite
Chemical Formula: Al2SiO5
Silicate Structural Class: Nesosilicate
Diagnostics Properties:
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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:
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Type of Rock: Aluminium-rich metamorphic rocks
<Tab/>Temperature: Forms at temperatures greater than 550oC(2…
