Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.1-3.21.79
1
7.18
👆🏻
Fracture
-
Irregular/uneven
Cleavage
Vitreous, pearly on cleavage
Perfect on {10bar10}
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
Ca6(Al,Si)2(SO4)2B(OH)4(OH,O)12•26(H2O)