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Moldavite
Moldavite

Kyanite
Kyanite



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Kyanite
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Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
-
-
-
2.32-2.38
ConchoidalWalter Schumann
None
5.5
SiO 2(+Al 2O 3)Walter Schumann , Gemstones of the world (2001)
 
Brittle
-
-
3.53-3.65
Splintery
[100] perfect [010] imperfect with 79° angle between
4-7
Al2SiO5