Astrophyllite and Anhydrite Physical Properties

Astrophyllite

Anhydrite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.2-3.42.90-2.98

1 7.18

1.5 Fracture

Uneven, Brittle, Metallic

Conchoidal, Brittle, Conchoidal, UnevenArthur Thomas, Gemstones (2009), Brittle, Conchoidal

1.6 Cleavage

Perfect on [001] imperfect on [100]

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

1.7 Mohs Hardness

33.5

2 10

1.8 Chemical Composition

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

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

Astrophyllite and Anhydrite Chemical Formula

While comparing Astrophyllite 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 Astrophyllite and Anhydrite chemical formula.

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

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Astrophyllite and Anhydrite Specific Gravity

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