Biotite and Gahnite Physical Properties

Biotite

Gahnite

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1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.7-3.34.00-4.62

1 7.18

1.5 Fracture

Uneven, Even, Yellow, White

Conchoidal, Uneven

1.6 Cleavage

Perfect on the {001}

Indistinct parting on [111]

1.7 Mohs Hardness

2.5-3.07.5-8

2 10

1.8 Chemical Composition

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

ZnAl 2O 4Michael OâDonoghue , Gems, Sixth Edition (2006)

Biotite and Gahnite Chemical Formula

While comparing Biotite and Gahnite 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 Gahnite chemical formula.

Chemical formula of Biotite- K(Mg,Fe++)3[AlSi3O10(OH,F)2
Chemical formula of Gahnite- ZnAl 2O 4Michael OâDonoghue , Gems, Sixth Edition (2006)

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Biotite and Gahnite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Biotite and Gahnite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Biotite and Gahnite Optical Properties during the identification of gemstone. Specific gravity of Biotite is 4.00-4.62 whereas that of Gahnite is 4.00-4.62.