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Austinite and Sillimanite Physical Properties


Sillimanite and Austinite Physical Properties


Physical Properties

Tenacity
Brittle   
Tough   

Solubility
Easily soluble in cold dilute HCl   
Not Available   

Durability
Not Available   
Not Available   

Specific Gravity
4.12   
3.20-3.26   

Fracture
Brittle, Uneven, Brittle, Uneven   
Splintery   

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

Mohs Hardness
4-4.5   
6-7.5   

Chemical Composition
CaZn(AsO4)(OH)   
Al 2SiO 5Michael O’Donoghue , Gems, Sixth Edition (2006)   

Optical Properties >>
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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.

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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.

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Green Gemstones


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