Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
5.6-5.762.62-2.67
1
7.18
👆🏻
Fracture
Uneven
Uneven
Cleavage
[001] perfect; [100] distinct
From the Greek, oligos and kasein, little cleavage.
Mohs Hardness
2.5-36-6.5
2
10
👆🏻
Chemical Composition
Pb 5Cu 2(SO 4) 3(CO 3)(OH) 6Anthony et al , Handbook of mineralogy (2001)
Na(90-70%)Ca(10-30%)(Al,Si)AlSi 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)