Tenacity
Brittle
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.74-2.905.00-5.30
1
7.18
👆🏻
Fracture
Uneven, Splintery
Uneven, ConchoidalWalter Schumann, Conchoidal
Cleavage
Perfect on {100} and {001}
None, may show partings on {0001} and {10 1 1}
Mohs Hardness
4.5-56
2
10
👆🏻
Chemical Composition
Ca 2NaHSi 3O 9Ulrich Henn and Claudio C.
Fe 2O 3Arthur Thomas , Gemstones (2009)