Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
1.65-1.995.5
1
7.18
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Fracture
Uneven
Conchoidal
Cleavage
{010} Perfect, {110} Perfect
{111} Indistinct, {111} Indistinct, {111} Indistinct
Mohs Hardness
2-2.55-5.5
2
10
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Chemical Composition
NaCaB 5O 6(OH) 6 · 5H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
(Ca,Na) 2Ta 2O 6(O,OH,F)Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references