Colorless, Yellow, Brownish, Red, Violet, Blue, gray
Brown, Colorless, Brown, Brownish, Black, Colorless, Green, Greenish
Splintery, Conchoidal, Brittle
ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009), Brittle, Conchoidal