Star Sapphire and Austinite Physical Properties

Star Sapphire

Austinite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Not Available

Easily soluble in cold dilute HCl

1.3 Durability

Not Available

1.4 Specific Gravity

3.90-4.054.12

1 7.18

1.5 Fracture

Not Available

Brittle, Uneven, Brittle, Uneven

1.6 Cleavage

Not Available

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

1.7 Mohs Hardness

Not Available4-4.5

2 10

1.8 Chemical Composition

Al 2O 3Ulrich Henn and Claudio C.

CaZn(AsO4)(OH)

Star Sapphire and Austinite Chemical Formula

While comparing Star Sapphire 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 Star Sapphire and Austinite chemical formula.

Chemical formula of Star Sapphire- Al 2O 3Ulrich Henn and Claudio C.
Chemical formula of Austinite- CaZn(AsO4)(OH)

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Star Sapphire and Austinite Specific Gravity

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