Lazurite and Anhydrite Physical Properties

Lazurite

Anhydrite

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Physical Properties

Tenacity

Brittle

Solubility

Soluble

Durability

Specific Gravity

2.752.90-2.98

1 7.18

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Fracture

Uneven, Conchoidal

Conchoidal

Cleavage

Imperfect on {110}

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

Mohs Hardness

5.53.5

2 10

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Chemical Composition

(Na,Ca) 8Al 6Si 6O 24(SO 4,S,Cl) 2Ulrich Henn and Claudio C.

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

Lazurite and Anhydrite Chemical Formula

While comparing Lazurite 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 Lazurite and Anhydrite chemical formula.

Chemical formula of Lazurite- (Na,Ca) 8Al 6Si 6O 24(SO 4,S,Cl) 2Ulrich Henn and Claudio C.
Chemical formula of Anhydrite- CaSO 4Michael OâDonoghue , Gems, Sixth edition (2006) More from other references

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Lazurite and Anhydrite Specific Gravity

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