Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
4.3925.6-5.76
1
7.18
👆🏻
Fracture
Conchoidal
Uneven
Cleavage
{010} moderate, {100} imperfect
[001] perfect; [100] distinct
Mohs Hardness
6.5-72.5-3
2
10
👆🏻
Chemical Composition
Fe 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006)
Pb 5Cu 2(SO 4) 3(CO 3)(OH) 6Anthony et al , Handbook of mineralogy (2001)