Biotite and Cinnabar Physical Properties

Biotite

Cinnabar

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Physical Properties

Tenacity

Brittle

Slightly sectile

Solubility

1.04 x 10⁻²⁵ g per 100 ml water (Ksp at 25°C = 2 x 10⁻³²)

Durability

Specific Gravity

2.7-3.32

1 7.18

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Fracture

Uneven, Even

Uneven

Cleavage

Perfect on the {001}

Prismatic {10 1 0}, perfect

Mohs Hardness

2.5-3.02-2.5

2 10

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Chemical Composition

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

HgSMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references

Biotite and Cinnabar Chemical Formula

While comparing Biotite and Cinnabar 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 Cinnabar chemical formula.

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

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Biotite and Cinnabar Specific Gravity

Another important criteria for qualitative analysis of gemstones is Biotite and Cinnabar Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Biotite and Cinnabar Optical Properties during the identification of gemstone. Specific gravity of Biotite is 2 whereas that of Cinnabar is 2.