Gypsum and Anorthite Physical Properties

Gypsum

Anorthite

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1 Physical Properties

1.1 Tenacity

Flexible

Brittle

1.2 Solubility

Soluble

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.20-2.402.77

1 7.18

1.5 Fracture

Conchoidal, Splintery, Fibrous, UnevenArthur Thomas, Gemstones (2009)

Uneven, Uneven, Gems, Sixth Edition (2006)

1.6 Cleavage

Perfect on {010}, distinct on {100}

Perfect [001] good [010] poor [110]

1.7 Mohs Hardness

26-6.5

2 10

1.8 Chemical Composition

CaSO 4 -2(H 2O)Arthur Thomas , Gemstones (2009)

CaAl 2Si 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)

Gypsum and Anorthite Chemical Formula

While comparing Gypsum 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 Gypsum and Anorthite chemical formula.

Chemical formula of Gypsum- CaSO 4 -2(H 2O)Arthur Thomas , Gemstones (2009)
Chemical formula of Anorthite- CaAl 2Si 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)

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Gypsum and Anorthite Specific Gravity

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