Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.1-3.55.00-5.30
1
7.18
👆🏻
Fracture
Granular
Uneven, ConchoidalWalter Schumann, Conchoidal
Cleavage
None
None, may show partings on {0001} and {10 1 1}
Mohs Hardness
5-66
2
10
👆🏻
Chemical Composition
Ca 2(Mg,Fe)Al 2(SiO 4)(Si 2O 7)(OH) 2 · H 2O)Arthur Thomas , Gemstones (2009)
Fe 2O 3Arthur Thomas , Gemstones (2009)