Tenacity
Brittle
-
Solubility
Soluble
-
Durability
-
-
Specific Gravity
2.67-2.735.5
1
7.18
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Fracture
Conchoidal
Conchoidal
Cleavage
Perfect on [10 1 1] three directions with angle of 74° 55
{111} Indistinct, {111} Indistinct, {111} Indistinct
Mohs Hardness
35-5.5
2
10
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Chemical Composition
CaCO 3Ulrich Henn and Claudio C.
(Ca,Na) 2Ta 2O 6(O,OH,F)Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references