Sillimanite and Austinite Physical Properties

Sillimanite

Austinite

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1 Physical Properties

1.1 Tenacity

Tough

Brittle

1.2 Solubility

Not Available

Easily soluble in cold dilute HCl

1.3 Durability

Not Available

1.4 Specific Gravity

3.20-3.264.12

1 7.18

1.5 Fracture

Splintery

Brittle, Uneven, Brittle, Uneven

1.6 Cleavage

{010} perfect

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

1.7 Mohs Hardness

6-7.54-4.5

2 10

1.8 Chemical Composition

Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)

CaZn(AsO4)(OH)

Sillimanite and Austinite Chemical Formula

While comparing Sillimanite 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 Sillimanite and Austinite chemical formula.

Chemical formula of Sillimanite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
Chemical formula of Austinite- CaZn(AsO4)(OH)

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Sillimanite and Austinite Specific Gravity

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