Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.50-3.602.55-2.63
1
7.18
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Fracture
Uneven
Uneven
Cleavage
Good on {110}, (110) ^ (1 1 0) ≈87°; parting on {100}
{001} Perfect, {010} Good
Mohs Hardness
66-6.5
2
10
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Chemical Composition
(Na,Fe,Ca)Si 2O 6Ulrich Henn and Claudio C.
KAlSi 3O 8Arthur Thomas , Gemstones (2009)