Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.05-3.213.1-3.2
1
7.18
👆🏻
Fracture
-
-
Cleavage
None
Vitreous, pearly on cleavage
Mohs Hardness
7-7.53-4
2
10
👆🏻
Chemical Composition
(Al,Mn3+ ) 2SiO 4OGemdat.org , Management Team (2012)
(Fe2+ ,Mg,Mn2+ ) 3(PO 4) 2 · 4H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references