Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.65-4.553.85-3.94
1
7.18
👆🏻
Fracture
Conchoidal
Conchoidal, Uneven
Cleavage
None, but may exhibit slight parting
{010} Good, {100} Distinct
Mohs Hardness
7.5-85-5.5
2
10
👆🏻
Chemical Composition
(Mg,Zn)Al 2O 4Gemdat.org , Management Team (2012)
(Mn2+ ,Fe2+ ,Mg,Ca) 2(PO 4)(F,OH)Michael OâDonoghue , Gems, Sixth Edition (2006)