Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.50-3.602.74-2.76
1
7.18
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Fracture
Uneven
Uneven
Cleavage
Good on {110}, (110) ^ (1 1 0) ≈87°; parting on {100}
{010} Perfect, {001} Distinct
Mohs Hardness
63.5-4
2
10
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Chemical Composition
(Na,Fe,Ca)Si 2O 6Ulrich Henn and Claudio C.
Fe3+ PO 4 · 2H 2OAnthony et al , Handbook of Mineralogy (2001)