Gahnite and Biotite Physical Properties

Gahnite

Biotite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

4.00-4.622.7-3.3

1 7.18

1.5 Fracture

Conchoidal, Uneven

Uneven, Even, Yellow, White

1.6 Cleavage

Indistinct parting on [111]

Perfect on the {001}

1.7 Mohs Hardness

7.5-82.5-3.0

2 10

1.8 Chemical Composition

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

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

Gahnite and Biotite Chemical Formula

While comparing Gahnite 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 Gahnite and Biotite chemical formula.

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

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Gahnite and Biotite Specific Gravity

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