Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.19-3.563.1-3.2
1
7.18
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Fracture
Uneven, Conchoidal
-
Cleavage
{110} Perfect, {010} Indistinct
Vitreous, pearly on cleavage
Mohs Hardness
5.5-63-4
2
10
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Chemical Composition
(Ca,Na)(Mg,Fe,Al,Ti)(Si,Al) 2O 6Anthony et al , Handbook of mineralogy (2001)
(Fe2+ ,Mg,Mn2+ ) 3(PO 4) 2 · 4H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references