Austinite and Polyhalite Physical Properties

Austinite

Polyhalite

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1 Physical Properties

1.1 Tenacity

Brittle

1.2 Solubility

Easily soluble in cold dilute HCl

Soluble

1.3 Durability

Not Available

1.4 Specific Gravity

4.122.78

1 7.18

1.5 Fracture

Brittle, Uneven, Brittle, Uneven

Conchoidal, Brittle

1.6 Cleavage

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

Perfect on {10 1 }; parting on {010}

1.7 Mohs Hardness

4-4.53.5

2 10

1.8 Chemical Composition

CaZn(AsO4)(OH)

Not Available

Austinite and Polyhalite Chemical Formula

While comparing Austinite and Polyhalite 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 Austinite and Polyhalite chemical formula.

Chemical formula of Austinite- CaZn(AsO4)(OH)

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Austinite Vs Clintonite

Austinite Vs Apophyllite KF

Austinite Vs Cordierite

Austinite and Polyhalite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Austinite and Polyhalite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Austinite and Polyhalite Optical Properties during the identification of gemstone. Specific gravity of Austinite is 2.78 whereas that of Polyhalite is 2.78.