Astrophyllite and Pyrite Physical Properties

Astrophyllite

Pyrite

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Physical Properties

Tenacity

Brittle

Solubility

insoluble in water

Durability

Specific Gravity

3.2-3.45.00-5.20

1 7.18

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Fracture

Uneven

Uneven, Conchoidal, ConchoidalWalter Schumann

Cleavage

Perfect on [001] imperfect on [100]

Indistinct on {001}; partings on {011} and {111}

Mohs Hardness

36-6.5

2 10

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Chemical Composition

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

FeS 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

Astrophyllite and Pyrite Chemical Formula

While comparing Astrophyllite and Pyrite 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 Pyrite 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 Pyrite- FeS 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

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Astrophyllite and Pyrite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Astrophyllite and Pyrite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Astrophyllite and Pyrite Optical Properties during the identification of gemstone. Specific gravity of Astrophyllite is 5.00-5.20 whereas that of Pyrite is 5.00-5.20.