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Calcite
Calcite

Anorthite
Anorthite



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Calcite
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Anorthite

Calcite and Anorthite Physical Properties

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Physical Properties

Tenacity

Brittle
Brittle

Solubility

Soluble
-

Durability

-
-

Specific Gravity

2.67-2.732.77
1 7.18
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Fracture

Conchoidal
Uneven

Cleavage

Perfect on [10 1 1] three directions with angle of 74° 55
Perfect [001] good [010] poor [110]

Mohs Hardness

36-6.5
2 10
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Chemical Composition

CaCO 3Ulrich Henn and Claudio C.
CaAl 2Si 2O 8Michael O’Donoghue , Gems, Sixth Edition (2006)

Calcite and Anorthite Chemical Formula

While comparing Calcite and Anorthite 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 Calcite and Anorthite chemical formula.

  • Chemical formula of Calcite- CaCO 3Ulrich Henn and Claudio C.
  • Chemical formula of Anorthite- CaAl 2Si 2O 8Michael O’Donoghue , Gems, Sixth Edition (2006)

Calcite and Anorthite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Calcite and Anorthite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Calcite and Anorthite Optical Properties during the identification of gemstone. Specific gravity of Calcite is 2.77 whereas that of Anorthite is 2.77.