Tenacity
-
Brittle
Solubility
-
Soluble
Durability
-
-
Specific Gravity
3.1-3.22.20-2.23
1
7.18
👆🏻
Fracture
-
Irregular/uneven, Uneven
Cleavage
Vitreous, pearly on cleavage
Perfect on {110} and {1 1 0}
Mohs Hardness
3-45-5.5
2
10
👆🏻
Chemical Composition
(Fe2+ ,Mg,Mn2+ ) 3(PO 4) 2 · 4H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
CaAl 2Si 3O 10 · 3H 2OUlrich Henn and Claudio C.