Blue, Red, Yellow, Colorless, Blue, Colorless, Green, Yellow, White, Blue, Colorless, Green, Yellow, White
Colorless, White, Blue, Red, Reddish, Brownish
Uneven, Conchoidal, Brittle, Uneven, ConchoidalAnthony et al, Handbook of mineralogy (2001), Conchoidal, Brittle
Uneven, Brittle
Poor/indistinct on {1120} and {1011}
Perfect on [100], [010], [001]