Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.80-4.152.33-2.37
1
7.18
👆🏻
Fracture
Uneven
ConchoidalWalter Schumann
Cleavage
perfect along [010] and [100]
Perfect on {010}, good on {100}
Mohs Hardness
3.5-47.5
2
10
👆🏻
Chemical Composition
Cu 5(SiO 3) 4(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Be 2BO 3(OH)Ulrich Henn and Claudio C.