Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.1-3.22.60-2.65
1
7.18
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Fracture
-
Uneven, Conchoidal
Cleavage
Vitreous, pearly on cleavage
Perfect on {001}, very good on {010}, imperfect on {110}
Mohs Hardness
3-46-6.5
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
NaAlSi 3O 8Michael OâDonoghue , Gems, Sixth Edition (2006)