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Hardness: 2 - 3
Density: 2.7 - 3.4
Colours: Brown, black, reddish brown
| ||Crystal System: Monoclinic|
Cleavage: Perfect basal
Reaction with HCl: Very weak
Identification in hand sample:
Colour and habit
A very common mineral found in igneous, metamorphic and sedimentary rocks.
Industrial / ecomonic uses:
Altered into vermiculite, biotite is used as an insulation material and as filler in certain building supplies.