Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
-99993.7-3.8
1
7.18
👆🏻
Fracture
-
Subconchoidal, Conchoidal
Cleavage
-
Distinct on {010}
Mohs Hardness
-99997-7.5
2
10
👆🏻
Chemical Composition
SiO2, Al2O3, CaO, MgO, FeO
(Fe,Mg,Zn) 2Al 9(Si,Al) 4O 22(OH) 2Ulrich Henn and Claudio C.