Biotite and Augite Physical Properties

Biotite

Augite

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Physical Properties

Tenacity

Brittle

Solubility

Durability

Specific Gravity

2.7-3.33.19-3.56

1 7.18

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Fracture

Uneven, Even

Uneven, Conchoidal

Cleavage

Perfect on the {001}

{110} Perfect, {010} Indistinct

Mohs Hardness

2.5-3.05.5-6

2 10

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Chemical Composition

K(Mg,Fe++)3[AlSi3O10(OH,F)2

(Ca,Na)(Mg,Fe,Al,Ti)(Si,Al) 2O 6Anthony et al , Handbook of mineralogy (2001)

Biotite and Augite Chemical Formula

While comparing Biotite and Augite physical properties, the important data you should know is its chemical composition. Since chemical formula defines the molecular structure of the crystal, most of the physical properties like color, tenacity, solubility are governed by Biotite and Augite chemical formula.

Chemical formula of Biotite- K(Mg,Fe++)3[AlSi3O10(OH,F)2
Chemical formula of Augite- (Ca,Na)(Mg,Fe,Al,Ti)(Si,Al) 2O 6Anthony et al , Handbook of mineralogy (2001)

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Biotite and Augite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Biotite and Augite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Biotite and Augite Optical Properties during the identification of gemstone. Specific gravity of Biotite is 3.19-3.56 whereas that of Augite is 3.19-3.56.