Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
5.52.98-3.03
1
7.18
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Fracture
Conchoidal
Uneven
Cleavage
{111} Indistinct, {111} Indistinct, {111} Indistinct
[110] perfect; [010] distinct
Mohs Hardness
5-5.55-6
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
Ca 2Mg 5Si 8O 22(OH) 2Ulrich Henn and Claudio C.