Ettringite and Malachite Physical Properties

Ettringite

Malachite

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Partially soluble in water

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

1.773.25-4.10

1 7.18

1.5 Fracture

Not Available

Conchoidal, Conchoidal, Gemstones (2009), Uneven

1.6 Cleavage

Perfect on {10 1 0}

Perfect on { 2 01} fair on {010}

1.7 Mohs Hardness

2-2.53.5-4

2 10

1.8 Chemical Composition

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

Cu₂CO₃(OH)₂

Ettringite and Malachite Chemical Formula

While comparing Ettringite and Malachite 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 Ettringite and Malachite chemical formula.

Chemical formula of Ettringite- Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
Chemical formula of Malachite- Cu₂CO₃(OH)₂

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Ettringite and Malachite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Ettringite and Malachite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Ettringite and Malachite Optical Properties during the identification of gemstone. Specific gravity of Ettringite is 3.25-4.10 whereas that of Malachite is 3.25-4.10.