Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.1-3.23.25
1
7.18
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Fracture
-
-
Cleavage
Vitreous, pearly on cleavage
Imperfect in one direction
Mohs Hardness
3-45-5.5
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
CaCuAlSi 2O 6(OH) 3Michael OâDonoghue , Gems, Sixth Edition (2006)