Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.1-3.23.16-3.43
1
7.18
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Fracture
-
Uneven, Conchoidal
Cleavage
Vitreous, pearly on cleavage
{110} Good, {110} Good
Mohs Hardness
3-45-6
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
(Ca,Na)(Mg,Fe,Al)Si 2O 6Anthony et al , Handbook of Mineralogy (2001)