ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009)
Uneven, Uneven, ConchoidalAnthony et al, Handbook of mineralogy (2001), Conchoidal, Brittle
SiO 2Ulrich Henn and Claudio C.
Mg 3(SiO 4)(F,OH) 2Anthony et al , Handbook of Mineralogy (2001)