Mineral 1.0Test your knowledge of specific minerals

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BiotiteK(Mg,Fe)3(AlSi3O10)(OH)2

Class: Silicate
Subclass: Phyllosilicate
Hardness: 2 - 3
Density: 2.7 - 3.4
Streak: Colourless
Lustre: Vitreous
Habit: Micaceous
Colours: Brown, black, reddish brown

  Crystal System: Monoclinic
Cleavage: Perfect basal
Fracture: Uneven
Magnetism: None
Reaction with HCl: Very weak

Identification in hand sample:
Colour and habit

Associations:
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.

  

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