Corundum and Anorthite Physical Properties

Corundum

Anorthite

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1 Physical Properties

1.1 Tenacity

Brittle

1.2 Solubility

insoluble

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.90-4.052.77

1 7.18

1.5 Fracture

Uneven, Uneven, Gems, Difficult, Fibrous

Uneven, Uneven, Gems, Sixth Edition (2006)

1.6 Cleavage

None – parting in 3 directions

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

1.7 Mohs Hardness

96-6.5

2 10

1.8 Chemical Composition

Al 2O 3Arthur Thomas , Gemstones (2009)

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

Corundum and Anorthite Chemical Formula

While comparing Corundum 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 Corundum and Anorthite chemical formula.

Chemical formula of Corundum- Al 2O 3Arthur Thomas , Gemstones (2009)
Chemical formula of Anorthite- CaAl 2Si 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)

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Corundum and Anorthite Specific Gravity

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