Tenacity
Brittle
-
Solubility
-
insoluble
Durability
-
-
Specific Gravity
5.6-5.762.36
1
7.18
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Fracture
Uneven
Uneven, Subconchoidal, Fibrous
Cleavage
[001] perfect; [100] distinct
[110] perfect, [101] good, [010] distinct
Mohs Hardness
2.5-33.5-4
2
10
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Chemical Composition
Pb 5Cu 2(SO 4) 3(CO 3)(OH) 6Anthony et al , Handbook of mineralogy (2001)
Al 3(PO 4) 2(OH,F) 3 · 5H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references