Tenacity
Brittle
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
5.00-5.303.50-3.60
1
7.18
👆🏻
Fracture
Uneven, ConchoidalWalter Schumann, Conchoidal
Uneven
Cleavage
None, may show partings on {0001} and {10 1 1}
Good on {110}, (110) ^ (1 1 0) ≈87°; parting on {100}
Mohs Hardness
66
2
10
👆🏻
Chemical Composition
Fe 2O 3Arthur Thomas , Gemstones (2009)
(Na,Fe,Ca)Si 2O 6Ulrich Henn and Claudio C.