Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.1-3.22.77-2.88
1
7.18
👆🏻
Fracture
-
Uneven
Cleavage
Vitreous, pearly on cleavage
Perfect basal
Mohs Hardness
3-42.5
2
10
👆🏻
Chemical Composition
(Fe2+ ,Mg,Mn2+ ) 3(PO 4) 2 · 4H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
K(Al,Cr) 3Si 3O 10(OH) 2Gemdat.org , Management Team (2012)