Tenacity
-
Brittle
Solubility
-
Gelatinises in acids
Durability
-
-
Specific Gravity
3.1-3.22.4-2.5
1
7.18
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Fracture
-
Uneven, Conchoidal
Cleavage
Vitreous, pearly on cleavage
Distinct on {110}
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
(Na,Ca)4-8Al6Si6(O,S)24(SO4,Cl)1-2