Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.69-2.792.90-2.98
1
7.18
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Fracture
Conchoidal
Conchoidal
Cleavage
Poor on {0001}
Rare tabular and prismatic crystals. Usually occurs as fibrous, parallel veins that break off into cleavage fragments.
Mohs Hardness
5.5-6.53.5
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
CaSO 4Michael OâDonoghue , Gems, Sixth edition (2006) More from other references