Biotite and Albite Physical Properties

Biotite

Albite

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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

2.7-3.32.60-2.65

1 7.18

1.5 Fracture

Uneven, Even, Yellow, White

Uneven, Uneven, Gems, Sixth Edition (2006), Uneven, Conchoidal

1.6 Cleavage

Perfect on the {001}

Perfect on {001}, very good on {010}, imperfect on {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

NaAlSi 3O 8Michael OâDonoghue , Gems, Sixth Edition (2006)

Biotite and Albite Chemical Formula

While comparing Biotite and Albite 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 Albite chemical formula.

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

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Biotite and Albite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Biotite and Albite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Biotite and Albite Optical Properties during the identification of gemstone. Specific gravity of Biotite is 2.60-2.65 whereas that of Albite is 2.60-2.65.