Biotite and Moonstone Physical Properties

Biotite

Moonstone

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Physical Properties

Tenacity

Brittle

Solubility

Durability

Specific Gravity

2.7-3.32.56-2.60

1 7.18

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Fracture

Uneven, Even

Uneven, ConchoidalWalter Schumann

Cleavage

Perfect on the {001}

2,1 basal ; 2,1 prismatic ; 3,1 pinacoidal

Mohs Hardness

2.5-3.06-6.5

2 10

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Chemical Composition

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

Plagioclase Feldspar s: (Na,Ca)Al_1-2Si_3-2O₈ Orthoclase Feldspar : KAlSi₃O₈

Biotite and Moonstone Chemical Formula

While comparing Biotite and Moonstone 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 Moonstone chemical formula.

Chemical formula of Biotite- K(Mg,Fe++)3[AlSi3O10(OH,F)2
Chemical formula of Moonstone- Plagioclase Feldspar s: (Na,Ca)Al_1-2Si_3-2O₈ Orthoclase Feldspar : KAlSi₃O₈

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Biotite and Moonstone Specific Gravity

Another important criteria for qualitative analysis of gemstones is Biotite and Moonstone Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Biotite and Moonstone Optical Properties during the identification of gemstone. Specific gravity of Biotite is 2.56-2.60 whereas that of Moonstone is 2.56-2.60.