Anhydrite and Astrophyllite Physical Properties

Anhydrite

Astrophyllite

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Physical Properties

Tenacity

Brittle

Solubility

Durability

Specific Gravity

2.90-2.983.2-3.4

1 7.18

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Fracture

Conchoidal

Uneven

Cleavage

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

Perfect on [001] imperfect on [100]

Mohs Hardness

3.53

2 10

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Chemical Composition

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

(K,Na) 3(Fe2+ ,Mn) 7Ti 2Si 8O 24(O,OH) 7Anthony et al , Handbook of mineralogy (2001)

Anhydrite and Astrophyllite Chemical Formula

While comparing Anhydrite and Astrophyllite 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 Astrophyllite chemical formula.

Chemical formula of Anhydrite- CaSO 4Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
Chemical formula of Astrophyllite- (K,Na) 3(Fe2+ ,Mn) 7Ti 2Si 8O 24(O,OH) 7Anthony et al , Handbook of mineralogy (2001)

Compare Blue Gemstones

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Anhydrite and Astrophyllite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Anhydrite and Astrophyllite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Anhydrite and Astrophyllite Optical Properties during the identification of gemstone. Specific gravity of Anhydrite is 3.2-3.4 whereas that of Astrophyllite is 3.2-3.4.