Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.62-4.333.87-4.14
1
7.18
👆🏻
Fracture
Uneven
Subconchoidal, Conchoidal
Cleavage
Indiscernible
Poor on {120}, in traces on {001}
Mohs Hardness
7-7.55.5-6
2
10
👆🏻
Chemical Composition
Mg 3Al 2(SiO 4) 3 -Mn2+3Al 2(SiO 4) 3Gemdat.org , Management Team (2012)
TiO 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references