Anhydrite and Pyrite Physical Properties

Anhydrite

Pyrite

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Physical Properties

Tenacity

Brittle

Solubility

insoluble in water

Durability

Specific Gravity

2.90-2.985.00-5.20

1 7.18

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Fracture

Conchoidal

Uneven, Conchoidal, ConchoidalWalter Schumann

Cleavage

Rare tabular and prismatic crystals. Usually occurs as fibrous, parallel veins that break off into cleavage fragments.

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

Mohs Hardness

3.56-6.5

2 10

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Chemical Composition

CaSO 4Michael OâDonoghue , Gems, Sixth edition (2006) More from other references

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

Anhydrite and Pyrite Chemical Formula

While comparing Anhydrite 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 Anhydrite and Pyrite chemical formula.

Chemical formula of Anhydrite- CaSO 4Michael 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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Anhydrite and Pyrite Specific Gravity

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