Tenacity
Brittle
-
Solubility
H₂SO₄
-
Durability
-
-
Specific Gravity
2.74-3.005.5
1
7.18
👆🏻
Fracture
Uneven
Conchoidal
Cleavage
Distinct on {0001} imperfect on {11 2 0}
{111} Indistinct, {111} Indistinct, {111} Indistinct
Mohs Hardness
5-5.55-5.5
2
10
👆🏻
Chemical Composition
Na 4(Ca,Ce) 2(Fe,Mn,Y)ZrSi 8O 22(OH,Cl) 2Ulrich Henn and Claudio C.
(Ca,Na) 2Ta 2O 6(O,OH,F)Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references