Tenacity
-
Brittle
Solubility
-
Soluble
Durability
-
-
Specific Gravity
3.63-3.93.30-3.50
1
7.18
👆🏻
Fracture
Conchoidal, Uneven
Uneven, ConchoidalWalter Schumann, Conchoidal
Cleavage
Indistinct
Perfect on {110}, poor on {101}, {001} rare
Mohs Hardness
7.5-85
2
10
👆🏻
Chemical Composition
(Mg,Fe2+ )Al 2O 4Gemdat.org , Management Team (2012) More from other references
Zn 4Si 2O 7(OH) 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references