Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
5.352.40-2.42
1
7.18
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Fracture
Conchoidal
-
Cleavage
Perfect on {100}, imperfect on {001}
{010} Perfect, {001} Distinct
Mohs Hardness
2.54.5
2
10
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Chemical Composition
PbCu(SO 4)(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006)
Ca 2B 6O 11 · 5H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references