Atacamite and Sillimanite Physical Properties

Atacamite

Sillimanite

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1 Physical Properties

1.1 Tenacity

Brittle

Tough

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.745-3.7763.20-3.26

1 7.18

1.5 Fracture

Conchoidal, Conchoidal, Brittle

Splintery

1.6 Cleavage

Perfect on {010}, fair on {101}

{010} perfect

1.7 Mohs Hardness

3-3.56-7.5

2 10

1.8 Chemical Composition

Cu2Cl(OH)3

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

Atacamite and Sillimanite Chemical Formula

While comparing Atacamite 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 Atacamite and Sillimanite chemical formula.

Chemical formula of Atacamite- Cu2Cl(OH)3
Chemical formula of Sillimanite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)

Compare Green Gemstones

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Atacamite Vs Cordierite

Atacamite and Sillimanite Specific Gravity

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