Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.50-3.605.35
1
7.18
👆🏻
Fracture
Uneven
Conchoidal
Cleavage
Good on {110}, (110) ^ (1 1 0) ≈87°; parting on {100}
Perfect on {100}, imperfect on {001}
Mohs Hardness
62.5
2
10
👆🏻
Chemical Composition
(Na,Fe,Ca)Si 2O 6Ulrich Henn and Claudio C.
PbCu(SO 4)(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006)