Almandine and Atacamite Physical Properties

Almandine

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

3.95-4.30

3.745-3.776

1.5 Fracture

Conchoidal, Brittle, Conchoidal, Brittle, Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Brittle, Conchoidal

Conchoidal, Conchoidal, Brittle

1.6 Cleavage

none

Perfect on {010}, fair on {101}

1.7 Mohs Hardness

7-7.5

3-3.5

1.8 Chemical Composition

Fe 3Al 2(SiO 4) 3Arthur Thomas , Gemstones (2009)

Cu2Cl(OH)3

Almandine and Atacamite Chemical Formula

While comparing Almandine 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 Almandine and Atacamite chemical formula.

Chemical formula of Almandine- Fe 3Al 2(SiO 4) 3Arthur Thomas , Gemstones (2009)
Chemical formula of Atacamite- Cu2Cl(OH)3

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Almandine and Atacamite Specific Gravity

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