Astrophyllite and Covellite Physical Properties

Astrophyllite

Covellite

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1 Physical Properties

1.1 Tenacity

Not Available

Flexible

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.2-3.44.6-4.76

1 7.18

1.5 Fracture

Uneven, Brittle, Metallic

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

1.6 Cleavage

Perfect on [001] imperfect on [100]

Perfect on {0001}

1.7 Mohs Hardness

3Not Available

2 10

1.8 Chemical Composition

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

CuSMichael OâDonoghue , Gems, Sixth edition (2006) More from other references

Astrophyllite and Covellite Chemical Formula

While comparing Astrophyllite and Covellite 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 Covellite 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 Covellite- CuSMichael OâDonoghue , Gems, Sixth edition (2006) More from other references

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Astrophyllite and Covellite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Astrophyllite and Covellite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Astrophyllite and Covellite Optical Properties during the identification of gemstone. Specific gravity of Astrophyllite is 4.6-4.76 whereas that of Covellite is 4.6-4.76.