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Sillimanite and Lazurite Physical Properties


Lazurite and Sillimanite Physical Properties


Physical Properties

Tenacity
Tough   
Brittle   

Solubility
Not Available   
Soluble   

Durability
Not Available   
Not Available   

Specific Gravity
3.20-3.26   
2.75   

Fracture
Splintery   
Uneven, UnevenArthur Thomas, Gemstones (2009), Conchoidal, Brittle   

Cleavage
{010} perfect   
Imperfect on {110}   

Mohs Hardness
6-7.5   
5.5   

Chemical Composition
Al 2SiO 5Michael O’Donoghue , Gems, Sixth Edition (2006)   
(Na,Ca) 8Al 6Si 6O 24(SO 4,S,Cl) 2Ulrich Henn and Claudio C.   

Optical Properties >>
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Sillimanite and Lazurite Chemical Formula

While comparing Sillimanite and Lazurite 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 Lazurite chemical formula.

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Sillimanite and Lazurite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Sillimanite and Lazurite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Sillimanite and Lazurite Optical Properties during the identification of gemstone. Specific gravity of Sillimanite is 2.75 whereas that of Lazurite is 2.75.

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