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.

Sistema Cristalino Monoclinic
Classe Mineral 09 Silicates
Dureza Mohs 2.5-3.0
Gravidade Específica 2.70-3.40
Cor Black, dark brown, dark green
Brilho Vitreous
Traço White to gray
Clivagem Perfect basal {001}
Fratura Uneven
Transparência Translucent
Hábito Cristalino Tabular, pseudo-hexagonal

Dureza Mohs

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

Sistema Cristalino

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.