Austinite and Sillimanite Physical Properties

Austinite

Sillimanite

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1 Physical Properties

1.1 Tenacity

Brittle

Tough

1.2 Solubility

Easily soluble in cold dilute HCl

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

4.123.20-3.26

1 7.18

1.5 Fracture

Brittle, Uneven, Brittle, Uneven

Splintery

1.6 Cleavage

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

{010} perfect

1.7 Mohs Hardness

4-4.56-7.5

2 10

1.8 Chemical Composition

CaZn(AsO4)(OH)

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

Austinite and Sillimanite Chemical Formula

While comparing Austinite and Sillimanite 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 Sillimanite chemical formula.

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

Compare Green Gemstones

Austinite Vs Cordierite

Austinite Vs Clintonite

Austinite Vs Apophyllite KF

Austinite and Sillimanite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Austinite and Sillimanite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Austinite and Sillimanite Optical Properties during the identification of gemstone. Specific gravity of Austinite is 3.20-3.26 whereas that of Sillimanite is 3.20-3.26.