Tenacity
Brittle
-
Solubility
Soluble
-
Durability
-
-
Specific Gravity
3.25-3.354.33-4.42
1
7.18
👆🏻
Fracture
Conchoidal, ConchoidalWalter Schumann
-
Cleavage
Perfect in three directions
Perfect
Mohs Hardness
54.5
2
10
👆🏻
Chemical Composition
CuSiO 2(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Ca(Nd,Ce,La) 2(CO 3) 3F 2Ulrich Henn and Claudio C.