Tenacity
Brittle
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
5.50-5.903.7-3.8
1
7.18
👆🏻
Fracture
Conchoidal
Subconchoidal, Conchoidal
Cleavage
On {10 1 0}, perfect; parting on {000 1 }
Distinct on {010}
Mohs Hardness
47-7.5
2
10
👆🏻
Chemical Composition
(Zn,Mn2+ )OMichael OâDonoghue , Gems, Sixth Edition (2006)
(Fe,Mg,Zn) 2Al 9(Si,Al) 4O 22(OH) 2Ulrich Henn and Claudio C.