Tenacity
Brittle
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
5.00-5.302.74-2.90
1
7.18
👆🏻
Fracture
Uneven, ConchoidalWalter Schumann, Conchoidal
Uneven, Splintery
Cleavage
None, may show partings on {0001} and {10 1 1}
Perfect on {100} and {001}
Mohs Hardness
64.5-5
2
10
👆🏻
Chemical Composition
Fe 2O 3Arthur Thomas , Gemstones (2009)
Ca 2NaHSi 3O 9Ulrich Henn and Claudio C.