Tenacity
-
-
Solubility
-
insoluble
Durability
-
-
Specific Gravity
3.1-3.22.36
1
7.18
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Fracture
-
Uneven, Subconchoidal, Fibrous
Cleavage
Vitreous, pearly on cleavage
[110] perfect, [101] good, [010] distinct
Mohs Hardness
3-43.5-4
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
Al 3(PO 4) 2(OH,F) 3 · 5H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references