Albite and Biotite Physical Properties

Albite

Biotite

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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

2.60-2.652.7-3.3

1 7.18

1.5 Fracture

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

Uneven, Even, Yellow, White

1.6 Cleavage

Perfect on {001}, very good on {010}, imperfect on {110}

Perfect on the {001}

1.7 Mohs Hardness

6-6.52.5-3.0

2 10

1.8 Chemical Composition

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

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

Albite and Biotite Chemical Formula

While comparing Albite and Biotite 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 Albite and Biotite chemical formula.

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

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Albite and Biotite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Albite and Biotite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Albite and Biotite Optical Properties during the identification of gemstone. Specific gravity of Albite is 2.7-3.3 whereas that of Biotite is 2.7-3.3.