Malachite and Andalusite Physical Properties

Malachite

Andalusite

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Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

3.25-4.103.05-3.21

1 7.18

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Fracture

Conchoidal, Uneven

Uneven, Subconchoidal, Splintery

Cleavage

Perfect on { 2 01} fair on {010}

Good on {110}, poor on {100}

Mohs Hardness

3.5-47.5

2 10

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Chemical Composition

Cu₂CO₃(OH)₂

Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references

Malachite and Andalusite Chemical Formula

While comparing Malachite and Andalusite 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 Andalusite chemical formula.

Chemical formula of Malachite- Cu₂CO₃(OH)₂
Chemical formula of Andalusite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references

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Malachite and Andalusite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Malachite and Andalusite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Malachite and Andalusite Optical Properties during the identification of gemstone. Specific gravity of Malachite is 3.05-3.21 whereas that of Andalusite is 3.05-3.21.