Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
5.52.08-2.16
1
7.18
👆🏻
Fracture
Conchoidal
Irregular/uneven
Cleavage
{111} Indistinct, {111} Indistinct, {111} Indistinct
distinct/good on {1011}
Mohs Hardness
5-5.54.5
2
10
👆🏻
Chemical Composition
(Ca,Na) 2Ta 2O 6(O,OH,F)Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
CaAl 2Si 4O 12 -6H 2OArthur Thomas , Gemstones (2009)