Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.69-2.725.5
1
7.18
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Fracture
Uneven, Conchoidal
Conchoidal
Cleavage
Perfect on {001}, less perfect on {010}, intersecting at near 90°; distinct on {110}
{111} Indistinct, {111} Indistinct, {111} Indistinct
Mohs Hardness
6-6.55-5.5
2
10
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Chemical Composition
(Na,Ca)1-2Si3-2O8
(Ca,Na) 2Ta 2O 6(O,OH,F)Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references