Tenacity
-
Brittle
Solubility
-
H₂SO₄
Durability
-
-
Specific Gravity
5.52.74-3.00
1
7.18
👆🏻
Fracture
Conchoidal
Uneven
Cleavage
{111} Indistinct, {111} Indistinct, {111} Indistinct
Distinct on {0001} imperfect on {11 2 0}
Mohs Hardness
5-5.55-5.5
2
10
👆🏻
Chemical Composition
(Ca,Na) 2Ta 2O 6(O,OH,F)Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Na 4(Ca,Ce) 2(Fe,Mn,Y)ZrSi 8O 22(OH,Cl) 2Ulrich Henn and Claudio C.