Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.1-3.23.50-3.60
1
7.18
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Fracture
-
Uneven
Cleavage
Vitreous, pearly on cleavage
Good on {110}, (110) ^ (1 1 0) ≈87°; parting on {100}
Mohs Hardness
3-46
2
10
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Chemical Composition
(Fe2+ ,Mg,Mn2+ ) 3(PO 4) 2 · 4H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
(Na,Fe,Ca)Si 2O 6Ulrich Henn and Claudio C.