Colorless, Yellow, Blue, Reddish, Black, Reddish, Brown, Blue, gray, Black, Reddish, Brown, Blue, gray
Reddish, Brown, Yellow, Green, Red, Greenish, gray
Subconchoidal, Conchoidal, Brittle, ConchoidalArthur Thomas, Gemstones (2009)
Conchoidal, Uneven, Brittle
Perfect on [001] and [011]
Imperfect on {001}, indistinct on {011}