Anorthite and Austinite Physical Properties

Anorthite

Austinite

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1 Physical Properties

1.1 Tenacity

Brittle

1.2 Solubility

Not Available

Easily soluble in cold dilute HCl

1.3 Durability

Not Available

1.4 Specific Gravity

2.774.12

1 7.18

1.5 Fracture

Uneven, Uneven, Gems, Sixth Edition (2006)

Brittle, Uneven, Brittle, Uneven

1.6 Cleavage

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

Good in two directions parallel to the prism faces {110}

1.7 Mohs Hardness

6-6.54-4.5

2 10

1.8 Chemical Composition

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

CaZn(AsO4)(OH)

Anorthite and Austinite Chemical Formula

While comparing Anorthite and Austinite 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 Anorthite and Austinite chemical formula.

Chemical formula of Anorthite- CaAl 2Si 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)
Chemical formula of Austinite- CaZn(AsO4)(OH)

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Anorthite and Austinite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Anorthite and Austinite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Anorthite and Austinite Optical Properties during the identification of gemstone. Specific gravity of Anorthite is 4.12 whereas that of Austinite is 4.12.