Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009), Brittle, Conchoidal
Uneven, Uneven, Conchoidal, Uneven, Gems, Sixth Edition (2006)
Perfect on [10 1 1] three directions with angle of 74° 55
Perfect on {001}, good on {010}