Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.55-2.635.2
1
7.18
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Fracture
Uneven
Subconchoidal, Conchoidal
Cleavage
{001} Perfect, {010} Good
Good in one direction
Mohs Hardness
6-6.56-6.5
2
10
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Chemical Composition
KAlSi 3O 8Arthur Thomas , Gemstones (2009)
(Fe,Mn)Ta 2O 6Walter Schumann , Gemstones of the world (2001) More from other references