Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.74-2.763.50-3.60
1
7.18
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Fracture
Uneven
Uneven
Cleavage
{010} Perfect, {001} Distinct
Good on {110}, (110) ^ (1 1 0) ≈87°; parting on {100}
Mohs Hardness
3.5-46
2
10
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Chemical Composition
Fe3+ PO 4 · 2H 2OAnthony et al , Handbook of Mineralogy (2001)
(Na,Fe,Ca)Si 2O 6Ulrich Henn and Claudio C.