Apatite and Anhydrite Physical Properties

Apatite

Anhydrite

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Physical Properties

Tenacity

Brittle

Solubility

Durability

Specific Gravity

3.16-3.232.90-2.98

1 7.18

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Fracture

Conchoidal, Uneven, Conchoidal to uneven

Conchoidal

Cleavage

[0001] indistinct, [1010] indistinct

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

Mohs Hardness

53.5

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

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

Apatite and Anhydrite Chemical Formula

While comparing Apatite and Anhydrite 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 Anhydrite 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 Anhydrite- CaSO 4Michael OâDonoghue , Gems, Sixth edition (2006) More from other references

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Apatite and Anhydrite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Apatite and Anhydrite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Apatite and Anhydrite Optical Properties during the identification of gemstone. Specific gravity of Apatite is 2.90-2.98 whereas that of Anhydrite is 2.90-2.98.