Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.72-2.835.5
1
7.18
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Fracture
Uneven
Conchoidal
Cleavage
Good on {100} and {110}
{111} Indistinct, {111} Indistinct, {111} Indistinct
Mohs Hardness
6-75-5.5
2
10
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Chemical Composition
Na 2(Ti,Fe)Si 4(O,F) 11Ulrich Henn and Claudio C.
(Ca,Na) 2Ta 2O 6(O,OH,F)Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references