Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.50-3.603.1-3.2
1
7.18
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Fracture
Uneven
-
Cleavage
Good on {110}, (110) ^ (1 1 0) ≈87°; parting on {100}
Vitreous, pearly on cleavage
Mohs Hardness
63-4
2
10
👆🏻
Chemical Composition
(Na,Fe,Ca)Si 2O 6Ulrich Henn and Claudio C.
(Fe2+ ,Mg,Mn2+ ) 3(PO 4) 2 · 4H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references