Malachite and Petalite Physical Properties

Malachite

Petalite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Not Available

insoluble

1.3 Durability

Not Available

1.4 Specific Gravity

3.25-4.102.40

1 7.18

1.5 Fracture

Conchoidal, Conchoidal, Gemstones (2009), Uneven

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

1.6 Cleavage

Perfect on { 2 01} fair on {010}

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

1.7 Mohs Hardness

3.5-46-6.5

2 10

1.8 Chemical Composition

Cu₂CO₃(OH)₂

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

Malachite and Petalite Chemical Formula

While comparing Malachite 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 Malachite and Petalite chemical formula.

Chemical formula of Malachite- Cu₂CO₃(OH)₂
Chemical formula of Petalite- LiAlSi 4O 10Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

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Malachite Vs Rhodochrosite

Malachite Vs Unakite

Malachite Vs Alexandrite

Malachite and Petalite Specific Gravity

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