Tenacity
-
Brittle
Solubility
-
H₂SO₄
Durability
-
-
Specific Gravity
3.252.74-3.00
1
7.18
👆🏻
Fracture
-
Uneven
Cleavage
Imperfect in one direction
Distinct on {0001} imperfect on {11 2 0}
Mohs Hardness
5-5.55-5.5
2
10
👆🏻
Chemical Composition
CaCuAlSi 2O 6(OH) 3Michael OâDonoghue , Gems, Sixth Edition (2006)
Na 4(Ca,Ce) 2(Fe,Mn,Y)ZrSi 8O 22(OH,Cl) 2Ulrich Henn and Claudio C.