Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.50-3.603.63-3.9
1
7.18
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Fracture
Uneven
Conchoidal, Uneven
Cleavage
Good on {110}, (110) ^ (1 1 0) ≈87°; parting on {100}
Indistinct
Mohs Hardness
67.5-8
2
10
👆🏻
Chemical Composition
(Na,Fe,Ca)Si 2O 6Ulrich Henn and Claudio C.
(Mg,Fe2+ )Al 2O 4Gemdat.org , Management Team (2012) More from other references