Tenacity
Brittle
-
Solubility
Soluble
-
Durability
-
-
Specific Gravity
3.25-3.352.90-3.02
1
7.18
👆🏻
Fracture
Conchoidal, ConchoidalWalter Schumann
Subconchoidal, Conchoidal
Cleavage
Perfect in three directions
Indistinct on {110}
Mohs Hardness
55-5.5
2
10
👆🏻
Chemical Composition
CuSiO 2(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
CaBePO 4(F,OH)Ulrich Henn and Claudio C.