Andalusite and Atacamite Physical Properties

Andalusite

Atacamite

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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

3.05-3.21

3.745-3.776

1.5 Fracture

Uneven, Subconchoidal, Uneven, Subconchoidal, Splintery, UnevenArthur Thomas, Gemstones (2009)

Conchoidal, Conchoidal, Brittle

1.6 Cleavage

Good on {110}, poor on {100}

Perfect on {010}, fair on {101}

1.7 Mohs Hardness

7.5

3-3.5

1.8 Chemical Composition

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

Cu2Cl(OH)3

Andalusite and Atacamite Chemical Formula

While comparing Andalusite and Atacamite 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 Andalusite and Atacamite chemical formula.

Chemical formula of Andalusite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
Chemical formula of Atacamite- Cu2Cl(OH)3

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Andalusite and Atacamite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Andalusite and Atacamite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Andalusite and Atacamite Optical Properties during the identification of gemstone. Specific gravity of Andalusite is 3.745-3.776 whereas that of Atacamite is 3.745-3.776.