Biotite and Anorthite Physical Properties

Biotite

Anorthite

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1 Physical Properties

1.1 Tenacity

Brittle

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.7-3.32.77

1 7.18

1.5 Fracture

Uneven, Even, Yellow, White

Uneven, Uneven, Gems, Sixth Edition (2006)

1.6 Cleavage

Perfect on the {001}

Perfect [001] good [010] poor [110]

1.7 Mohs Hardness

2.5-3.06-6.5

2 10

1.8 Chemical Composition

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

CaAl 2Si 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)

Biotite and Anorthite Chemical Formula

While comparing Biotite and Anorthite 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 Anorthite chemical formula.

Chemical formula of Biotite- K(Mg,Fe++)3[AlSi3O10(OH,F)2
Chemical formula of Anorthite- CaAl 2Si 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)

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Biotite and Anorthite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Biotite and Anorthite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Biotite and Anorthite Optical Properties during the identification of gemstone. Specific gravity of Biotite is 2.77 whereas that of Anorthite is 2.77.