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Bertrandite and Sillimanite Physical Properties


Sillimanite and Bertrandite Physical Properties


Physical Properties

Tenacity
Not Available   
Tough   

Solubility
Not Available   
Not Available   

Durability
Not Available   
Not Available   

Specific Gravity
2.59-2.60   
3.20-3.26   

Fracture
Brittle, Metallic, Brittle, Metallic   
Splintery   

Cleavage
{001} Perfect, {110} Distinct, {101} Distinct   
{010} perfect   

Mohs Hardness
6-7   
6-7.5   

Chemical Composition
Be 4Si 2O 7(OH) 2Anthony et al , Handbook of mineralogy (2001)   
Al 2SiO 5Michael O’Donoghue , Gems, Sixth Edition (2006)   

Optical Properties >>
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Bertrandite and Sillimanite Chemical Formula

While comparing Bertrandite 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 Bertrandite and Sillimanite chemical formula.

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Bertrandite and Sillimanite Specific Gravity

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

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