Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.1-3.25.50-5.90
1
7.18
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Fracture
-
Conchoidal
Cleavage
Vitreous, pearly on cleavage
On {10 1 0}, perfect; parting on {000 1 }
Mohs Hardness
3-44
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
(Zn,Mn2+ )OMichael OâDonoghue , Gems, Sixth Edition (2006)