Atacamite and Ettringite Physical Properties

Atacamite

Ettringite

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1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

Not Available

Partially soluble in water

1.3 Durability

Not Available

1.4 Specific Gravity

3.745-3.7761.77

1 7.18

1.5 Fracture

Conchoidal, Conchoidal, Brittle

Not Available

1.6 Cleavage

Perfect on {010}, fair on {101}

Perfect on {10 1 0}

1.7 Mohs Hardness

3-3.52-2.5

2 10

1.8 Chemical Composition

Cu2Cl(OH)3

Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)

Atacamite and Ettringite Chemical Formula

While comparing Atacamite and Ettringite 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 Ettringite chemical formula.

Chemical formula of Atacamite- Cu2Cl(OH)3
Chemical formula of Ettringite- Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)

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Atacamite and Ettringite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Atacamite and Ettringite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Atacamite and Ettringite Optical Properties during the identification of gemstone. Specific gravity of Atacamite is 1.77 whereas that of Ettringite is 1.77.