Afghanite and Anhydrite Physical Properties

Afghanite

Anhydrite

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Physical Properties

Tenacity

Brittle

Solubility

Durability

Specific Gravity

2.55-2.652.90-2.98

1 7.18

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Fracture

Conchoidal

Cleavage

Perfect {10 1 0}

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

Mohs Hardness

5.5-63.5

2 10

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Chemical Composition

(Na,Ca,K) 8(Si,Al) 12O 24(SO 4,Cl,CO 3) 3(H 2O)Arthur Thomas , Gemstones (2009)

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

Afghanite and Anhydrite Chemical Formula

While comparing Afghanite 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 Afghanite and Anhydrite chemical formula.

Chemical formula of Afghanite- (Na,Ca,K) 8(Si,Al) 12O 24(SO 4,Cl,CO 3) 3(H 2O)Arthur Thomas , Gemstones (2009)
Chemical formula of Anhydrite- CaSO 4Michael OâDonoghue , Gems, Sixth edition (2006) More from other references

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Afghanite and Anhydrite Specific Gravity

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