Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.50-3.603.85-3.94
1
7.18
👆🏻
Fracture
Uneven
Conchoidal, Uneven
Cleavage
Good on {110}, (110) ^ (1 1 0) ≈87°; parting on {100}
{010} Good, {100} Distinct
Mohs Hardness
65-5.5
2
10
👆🏻
Chemical Composition
(Na,Fe,Ca)Si 2O 6Ulrich Henn and Claudio C.
(Mn2+ ,Fe2+ ,Mg,Ca) 2(PO 4)(F,OH)Michael OâDonoghue , Gems, Sixth Edition (2006)