Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
5.50-5.902.11-2.20
1
7.18
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Fracture
Conchoidal
Uneven
Cleavage
On {10 1 0}, perfect; parting on {000 1 }
Perfect on {0001}
Mohs Hardness
4-9999
2
10
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Chemical Composition
(Zn,Mn2+ )OMichael OâDonoghue , Gems, Sixth Edition (2006)
Mg 6Cr 2(CO 3)(OH) 16 · 4H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references