Astrophyllite and Variscite Physical Properties

Astrophyllite

Variscite

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.2-3.42.42-2.58

1 7.18

1.5 Fracture

Uneven, Brittle, Metallic

Conchoidal, Splintery, ConchoidalWalter Schumann, Gemstones of the world (2001) More from other references, Brittle

1.6 Cleavage

Perfect on [001] imperfect on [100]

[010] perfect

1.7 Mohs Hardness

34-5

2 10

1.8 Chemical Composition

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

AlPO₄ · 2(H₂O)

Astrophyllite and Variscite Chemical Formula

While comparing Astrophyllite and Variscite 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 Variscite 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 Variscite- AlPO₄ · 2(H₂O)

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Astrophyllite and Variscite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Astrophyllite and Variscite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Astrophyllite and Variscite Optical Properties during the identification of gemstone. Specific gravity of Astrophyllite is 2.42-2.58 whereas that of Variscite is 2.42-2.58.