Ettringite and Calcite Physical Properties

Ettringite

Calcite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Partially soluble in water

Soluble

1.3 Durability

Not Available

1.4 Specific Gravity

1.772.67-2.73

1 7.18

1.5 Fracture

Not Available

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

1.6 Cleavage

Perfect on {10 1 0}

Perfect on [10 1 1] three directions with angle of 74° 55

1.7 Mohs Hardness

2-2.53

2 10

1.8 Chemical Composition

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

CaCO 3Ulrich Henn and Claudio C.

Ettringite and Calcite Chemical Formula

While comparing Ettringite and Calcite 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 Calcite chemical formula.

Chemical formula of Ettringite- Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
Chemical formula of Calcite- CaCO 3Ulrich Henn and Claudio C.

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Ettringite and Calcite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Ettringite and Calcite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Ettringite and Calcite Optical Properties during the identification of gemstone. Specific gravity of Ettringite is 2.67-2.73 whereas that of Calcite is 2.67-2.73.