Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
5.55.6-5.76
1
7.18
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Fracture
Conchoidal
Uneven
Cleavage
{111} Indistinct, {111} Indistinct, {111} Indistinct
[001] perfect; [100] distinct
Mohs Hardness
5-5.52.5-3
2
10
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Chemical Composition
(Ca,Na) 2Ta 2O 6(O,OH,F)Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Pb 5Cu 2(SO 4) 3(CO 3)(OH) 6Anthony et al , Handbook of mineralogy (2001)