Author:
Evaluation:
Published: 28.04.2005.
Language: English
Level: Secondary school
Literature: n/a
References: Not used
  • Essays 'Report on Alumino Silcate: Sillimanite', 1.
Extract

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/>Temperature: Forms at temperatures greater than 550oC(2…

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