Biotite

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

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Biotite is a common phyllosilicate mineral found in igneous and metamorphic rocks. It is distinguished from muscovite by its darker color due to iron and magnesium content. Biotite is an important indicator of metamorphic grade.

Système Cristallin Monoclinic
Classe Minérale 09 Silicates
Dureté Mohs 2.5-3.0
Densité 2.70-3.40
Couleur Black, dark brown, dark green
Éclat Vitreous
Trait White to gray
Clivage Perfect basal {001}
Cassure Uneven
Transparence Translucent
Habitus Cristallin Tabular, pseudo-hexagonal

Dureté Mohs

Mohs Hardness: 2,5 – 3,0
1 Soft10 Hard

Système Cristallin

Monoclinic

Frequently Asked Questions

What is the hardness of Biotite?
Biotite has a Mohs hardness of 2.5-3.0.
What crystal system does Biotite belong to?
Biotite crystallizes in the Monoclinic crystal system.
What color is Biotite?
Biotite is typically Black, dark brown, dark green.
What type of luster does Biotite have?
Biotite exhibits a Vitreous luster.
What is the chemical formula of Biotite?
The chemical formula of Biotite is K(Mg,Fe)3(AlSi3O10)(OH)2.