Biotite and Brookite Physical Properties

Biotite

Brookite

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Physical Properties

Tenacity

Brittle

Solubility

Durability

Specific Gravity

2.7-3.33.87-4.14

1 7.18

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Fracture

Uneven, Even

Subconchoidal, Conchoidal

Cleavage

Perfect on the {001}

Poor on {120}, in traces on {001}

Mohs Hardness

2.5-3.05.5-6

2 10

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Chemical Composition

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

TiO 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

Biotite and Brookite Chemical Formula

While comparing Biotite and Brookite 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 Brookite chemical formula.

Chemical formula of Biotite- K(Mg,Fe++)3[AlSi3O10(OH,F)2
Chemical formula of Brookite- TiO 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

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Biotite and Brookite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Biotite and Brookite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Biotite and Brookite Optical Properties during the identification of gemstone. Specific gravity of Biotite is 3.87-4.14 whereas that of Brookite is 3.87-4.14.