Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.95-3.075.5
1
7.18
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Fracture
Conchoidal
Conchoidal
Cleavage
Perfect on {110} at 56° and 124°; partings on {010} and {100}
{111} Indistinct, {111} Indistinct, {111} Indistinct
Mohs Hardness
5-65-5.5
2
10
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Chemical Composition
Ca 2Mg 5Si 8O 22(OH) 2Ulrich Henn and Claudio C.
(Ca,Na) 2Ta 2O 6(O,OH,F)Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references