Biotite and Hemimorphite Physical Properties

Biotite

Hemimorphite

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Physical Properties

Tenacity

Brittle

Solubility

Soluble

Durability

Specific Gravity

2.7-3.33.30-3.50

1 7.18

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Fracture

Uneven, Even

Uneven, ConchoidalWalter Schumann, Conchoidal

Cleavage

Perfect on the {001}

Perfect on {110}, poor on {101}, {001} rare

Mohs Hardness

2.5-3.05

2 10

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Chemical Composition

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

Zn 4Si 2O 7(OH) 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references

Biotite and Hemimorphite Chemical Formula

While comparing Biotite and Hemimorphite 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 Hemimorphite chemical formula.

Chemical formula of Biotite- K(Mg,Fe++)3[AlSi3O10(OH,F)2
Chemical formula of Hemimorphite- Zn 4Si 2O 7(OH) 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references

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Biotite and Hemimorphite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Biotite and Hemimorphite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Biotite and Hemimorphite Optical Properties during the identification of gemstone. Specific gravity of Biotite is 3.30-3.50 whereas that of Hemimorphite is 3.30-3.50.