Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.0-3.15.5
1
7.18
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Fracture
-
Conchoidal
Cleavage
Perfect on {001}
{111} Indistinct, {111} Indistinct, {111} Indistinct
Mohs Hardness
3.55-5.5
2
10
👆🏻
Chemical Composition
Ca(Mg,Al)3(Al3Si)O10(OH)2
(Ca,Na) 2Ta 2O 6(O,OH,F)Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references