Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
5.52.74-2.76
1
7.18
👆🏻
Fracture
Conchoidal
Uneven
Cleavage
{111} Indistinct, {111} Indistinct, {111} Indistinct
{010} Perfect, {001} Distinct
Mohs Hardness
5-5.53.5-4
2
10
👆🏻
Chemical Composition
(Ca,Na) 2Ta 2O 6(O,OH,F)Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Fe3+ PO 4 · 2H 2OAnthony et al , Handbook of Mineralogy (2001)