Biotite and Fluorite Physical Properties

Biotite

Fluorite

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Physical Properties

Tenacity

Brittle

Solubility

slightly water soluble and in hot hydrochloric acid

Durability

Specific Gravity

2.7-3.33.00-3.25

1 7.18

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Fracture

Uneven, Even

Subconchoidal, Uneven, ConchoidalWalter Schumann

Cleavage

Perfect on the {001}

Octahedral, perfect on {111}, parting on {011}

Mohs Hardness

2.5-3.04

2 10

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Chemical Composition

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

CaF₂

Biotite and Fluorite Chemical Formula

While comparing Biotite and Fluorite 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 Fluorite chemical formula.

Chemical formula of Biotite- K(Mg,Fe++)3[AlSi3O10(OH,F)2
Chemical formula of Fluorite- CaF₂

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Biotite and Fluorite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Biotite and Fluorite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Biotite and Fluorite Optical Properties during the identification of gemstone. Specific gravity of Biotite is 3.00-3.25 whereas that of Fluorite is 3.00-3.25.