Austinite and Alunite Physical Properties

Austinite

Alunite

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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

4.122.6-2.9

1 7.18

1.5 Fracture

Brittle, Uneven, Brittle, Uneven

Conchoidal, Uneven

1.6 Cleavage

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

On {0001}, perfect

1.7 Mohs Hardness

4-4.53.5-4

2 10

1.8 Chemical Composition

CaZn(AsO4)(OH)

KAl3(SO4)2(OH)6

Austinite and Alunite Chemical Formula

While comparing Austinite and Alunite 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 Alunite chemical formula.

Chemical formula of Austinite- CaZn(AsO4)(OH)
Chemical formula of Alunite- KAl3(SO4)2(OH)6

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Austinite and Alunite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Austinite and Alunite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Austinite and Alunite Optical Properties during the identification of gemstone. Specific gravity of Austinite is 2.6-2.9 whereas that of Alunite is 2.6-2.9.