Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.40-3.583.1-3.2
1
7.18
👆🏻
Fracture
Conchoidal, Uneven
-
Cleavage
{010} Perfect
Vitreous, pearly on cleavage
Mohs Hardness
7.53-4
2
10
👆🏻
Chemical Composition
(Al,Mg) 8(Al,Si) 6O 20Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
(Fe2+ ,Mg,Mn2+ ) 3(PO 4) 2 · 4H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references