Apatite and Cinnabar Physical Properties

Apatite

Cinnabar

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Physical Properties

Tenacity

Slightly sectile

Solubility

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

Durability

Specific Gravity

3.16-3.232

1 7.18

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Fracture

Conchoidal, Uneven, Conchoidal to uneven

Uneven

Cleavage

[0001] indistinct, [1010] indistinct

Prismatic {10 1 0}, perfect

Mohs Hardness

52-2.5

2 10

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Chemical Composition

Ca 5(PO 4) 3(F,OH,Cl)Walter Schumann , Gemstones of the world (2001) More from other references

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

Apatite and Cinnabar Chemical Formula

While comparing Apatite 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 Apatite and Cinnabar chemical formula.

Chemical formula of Apatite- Ca 5(PO 4) 3(F,OH,Cl)Walter Schumann , Gemstones of the world (2001) More from other references
Chemical formula of Cinnabar- HgSMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references

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Apatite and Cinnabar Specific Gravity

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