Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.1-3.22.9-3.5
1
7.18
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Fracture
-
Conchoidal
Cleavage
Vitreous, pearly on cleavage
{110} Perfect, {???} Distinct, {???} Distinct
Mohs Hardness
3-45.5-6
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
(Mg,Fe2+ ) 2(Mg,Fe2+ ) 5Si 8O 22(OH) 2Anthony et al , Handbook of mineralogy (2001)