Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
5.50-5.904.28-4.42
1
7.18
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Fracture
Conchoidal
Conchoidal
Cleavage
On {10 1 0}, perfect; parting on {000 1 }
Distinct on [010] and [100] poor on [101]
Mohs Hardness
45-5.5
2
10
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Chemical Composition
(Zn,Mn2+ )OMichael OâDonoghue , Gems, Sixth Edition (2006)
PbCa 3Zn 4(SiO 4) 4Anthony et al , Handbook of mineralogy (2001)