Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.6-3.33.70-3.90
1
7.18
👆🏻
Fracture
Lamellar
Conchoidal
Cleavage
Perfect 001
Perfect on {011}, fair on {100}, poor on {110}
Mohs Hardness
2-2.53.5-4
2
10
👆🏻
Chemical Composition
(Mg,Fe)3(Si,Al)4O10(OH)2·(Mg,Fe)3(OH)6
Cu 3(OH) 2(CO 3) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references