Biotite and Oligoclase Physical Properties

Biotite

Oligoclase

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Physical Properties

Tenacity

Brittle

Solubility

Durability

Specific Gravity

2.7-3.32.62-2.67

1 7.18

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Fracture

Uneven, Even

Uneven

Cleavage

Perfect on the {001}

From the Greek, oligos and kasein, little cleavage.

Mohs Hardness

2.5-3.06-6.5

2 10

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Chemical Composition

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

Na(90-70%)Ca(10-30%)(Al,Si)AlSi 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)

Biotite and Oligoclase Chemical Formula

While comparing Biotite and Oligoclase 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 Oligoclase chemical formula.

Chemical formula of Biotite- K(Mg,Fe++)3[AlSi3O10(OH,F)2
Chemical formula of Oligoclase- Na(90-70%)Ca(10-30%)(Al,Si)AlSi 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)

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Biotite and Oligoclase Specific Gravity

Another important criteria for qualitative analysis of gemstones is Biotite and Oligoclase Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Biotite and Oligoclase Optical Properties during the identification of gemstone. Specific gravity of Biotite is 2.62-2.67 whereas that of Oligoclase is 2.62-2.67.