Natural Indian Minerals
Silimanite Minerals

Name and Composition - Aluminium silicate: AI2SiO5.

Physical Properties - Occurs as brown, grey & green shaded, transparent to translucent long, cylindrical crystals having hardness 6.5-7.5 and sp.gr. 3.23-3.27.

Mode of Occurrence - Occurs at the contacts of regionally metamorphosed rocks resulting from thermal metamorphism of pelitic rocks.

Uses - In refractory and ceramic industries.

Mineral based Industries – There is no mineral based industry in the state.

Industrial Prospects – Nil.


Physical Properties
Hardness
Sp. gr.
Tenacity
Streak
Luster
6.5 to 7.5
3.23 to 3.27
White
Tough
Vitreous to subadamantine, silky
Chemical Properties
Chemical formula
Crystal system
Color
Aluminium silicate: AI2SiO5
Orthorhombic
Colourless or white to grey, also brown, yellow, yellow-green, grey-green, blue-green, blue; colourless in thin section
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