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.

晶系 Monoclinic
鉱物分類 09 Silicates
モース硬度 2.5-3.0
比重 2.70-3.40
色 Black, dark brown, dark green
光沢 Vitreous
条痕色 White to gray
劈開 Perfect basal {001}
断口 Uneven
透明度 Translucent
結晶習性 Tabular, pseudo-hexagonal

モース硬度

Mohs Hardness: 2.5 – 3.0
1 Soft10 Hard

晶系

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.