Cinnabar and Pyrite Physical Properties

Cinnabar

Pyrite

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Physical Properties

Tenacity

Slightly sectile

Brittle

Solubility

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

insoluble in water

Durability

Specific Gravity

25.00-5.20

1 7.18

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Fracture

Uneven

Uneven, Conchoidal, ConchoidalWalter Schumann

Cleavage

Prismatic {10 1 0}, perfect

Indistinct on {001}; partings on {011} and {111}

Mohs Hardness

2-2.56-6.5

2 10

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Chemical Composition

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

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

Cinnabar and Pyrite Chemical Formula

While comparing Cinnabar and Pyrite 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 Cinnabar and Pyrite chemical formula.

Chemical formula of Cinnabar- HgSMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Chemical formula of Pyrite- FeS 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

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Cinnabar and Pyrite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Cinnabar and Pyrite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Cinnabar and Pyrite Optical Properties during the identification of gemstone. Specific gravity of Cinnabar is 5.00-5.20 whereas that of Pyrite is 5.00-5.20.