Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.62-2.675.6-5.76
1
7.18
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Fracture
Uneven
Uneven
Cleavage
From the Greek, oligos and kasein, little cleavage.
[001] perfect; [100] distinct
Mohs Hardness
6-6.52.5-3
2
10
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Chemical Composition
Na(90-70%)Ca(10-30%)(Al,Si)AlSi 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)
Pb 5Cu 2(SO 4) 3(CO 3)(OH) 6Anthony et al , Handbook of mineralogy (2001)