Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
5.50-5.903.43-3.44
1
7.18
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Fracture
Conchoidal
-
Cleavage
On {10 1 0}, perfect; parting on {000 1 }
None Observed
Mohs Hardness
46.5-7
2
10
👆🏻
Chemical Composition
(Zn,Mn2+ )OMichael OâDonoghue , Gems, Sixth Edition (2006)
Ca 2(Mg,Al) 6(Si,Al,B) 6O 20Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references