Malachite and Sillimanite Physical Properties

Malachite

Sillimanite

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1 Physical Properties

1.1 Tenacity

Not Available

Tough

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.25-4.103.20-3.26

1 7.18

1.5 Fracture

Conchoidal, Conchoidal, Gemstones (2009), Uneven

Splintery

1.6 Cleavage

Perfect on { 2 01} fair on {010}

{010} perfect

1.7 Mohs Hardness

3.5-46-7.5

2 10

1.8 Chemical Composition

Cu₂CO₃(OH)₂

Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)

Malachite and Sillimanite Chemical Formula

While comparing Malachite and Sillimanite 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 Sillimanite chemical formula.

Chemical formula of Malachite- Cu₂CO₃(OH)₂
Chemical formula of Sillimanite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)

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Malachite and Sillimanite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Malachite and Sillimanite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Malachite and Sillimanite Optical Properties during the identification of gemstone. Specific gravity of Malachite is 3.20-3.26 whereas that of Sillimanite is 3.20-3.26.