Malachite and Poudretteite Physical Properties

Malachite

Poudretteite

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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

3.25-4.102.51-2.53

1 7.18

1.5 Fracture

Conchoidal, Conchoidal, Gemstones (2009), Uneven

Conchoidal, Splintery

1.6 Cleavage

Perfect on { 2 01} fair on {010}

None

1.7 Mohs Hardness

3.5-45

2 10

1.8 Chemical Composition

Cu₂CO₃(OH)₂

KNa 2B 3Si 12O 30Michael OâDonoghue , Gems, Sixth Edition (2006)

Malachite and Poudretteite Chemical Formula

While comparing Malachite and Poudretteite 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 Malachite and Poudretteite chemical formula.

Chemical formula of Malachite- Cu₂CO₃(OH)₂
Chemical formula of Poudretteite- KNa 2B 3Si 12O 30Michael OâDonoghue , Gems, Sixth Edition (2006)

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Malachite and Poudretteite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Malachite and Poudretteite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Malachite and Poudretteite Optical Properties during the identification of gemstone. Specific gravity of Malachite is 2.51-2.53 whereas that of Poudretteite is 2.51-2.53.