Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.69-2.792.54-2.78
1
7.18
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Fracture
Conchoidal
Conchoidal
Cleavage
Poor on {0001}
Good in three directions
Mohs Hardness
5.5-6.55-6
2
10
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Chemical Composition
KNa 2(Fe3+ ,Mn3+ ,Al) 2Li 3Si 12O 30Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
K(Ca,Na) 2Si 4O 10(OH,F) · H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references