Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.1-3.23.26-3.36
1
7.18
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Fracture
-
Conchoidal
Cleavage
Vitreous, pearly on cleavage
Good on {100}
Mohs Hardness
3-46.5-7
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,Fe,Mn,Mg) 3Al 2BSi 4O 15(OH)Walter Schumann , Gemstones of the world (2001) More from other references