Covellite and Petalite Physical Properties

Covellite

Petalite

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1 Physical Properties

1.1 Tenacity

Flexible

Brittle

1.2 Solubility

Not Available

insoluble

1.3 Durability

Not Available

1.4 Specific Gravity

4.6-4.762.40

1 7.18

1.5 Fracture

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

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

1.6 Cleavage

Perfect on {0001}

Perfect on {001}, poor on {201} with 38.5° angle between the two

1.7 Mohs Hardness

Not Available6-6.5

2 10

1.8 Chemical Composition

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

LiAlSi 4O 10Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

Covellite and Petalite Chemical Formula

While comparing Covellite and Petalite 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 Covellite and Petalite chemical formula.

Chemical formula of Covellite- CuSMichael OâDonoghue , Gems, Sixth edition (2006) More from other references
Chemical formula of Petalite- LiAlSi 4O 10Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

Compare Blue Gemstones

Covellite Vs Fluorapatite

Covellite Vs Falcons Eye

Covellite Vs Elbaite

Covellite and Petalite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Covellite and Petalite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Covellite and Petalite Optical Properties during the identification of gemstone. Specific gravity of Covellite is 2.40 whereas that of Petalite is 2.40.