Tenacity
Brittle
-
Solubility
Soluble
-
Durability
-
-
Specific Gravity
3.25-3.352.25-2.40
1
7.18
👆🏻
Fracture
Conchoidal, ConchoidalWalter Schumann
-
Cleavage
Perfect in three directions
perfect on {010}; good on {100}
Mohs Hardness
55-5.5
2
10
👆🏻
Chemical Composition
CuSiO 2(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
NaCa 2Al 5Si 5O 20 · 6H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references