Iolite and Austinite Physical Properties

Iolite

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

2.6-2.74.12

1 7.18

1.5 Fracture

Not Available

Brittle, Uneven, Brittle, Uneven

1.6 Cleavage

3,1

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

1.7 Mohs Hardness

7-7.54-4.5

2 10

1.8 Chemical Composition

Mg₂Al₄Si₅O₁₈

CaZn(AsO4)(OH)

Iolite and Austinite Chemical Formula

While comparing Iolite 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 Iolite and Austinite chemical formula.

Chemical formula of Iolite- Mg₂Al₄Si₅O₁₈
Chemical formula of Austinite- CaZn(AsO4)(OH)

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Iolite and Austinite Specific Gravity

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