Uneven, Uneven, ConchoidalArthur Thomas, Gemstones (2009), Conchoidal, Brittle
Uneven, Uneven, ConchoidalAnthony et al, Handbook of mineralogy (2001), Brittle, Conchoidal
Ca 3Al 2(SO 4)(F,OH) 10Ulrich Henn and Claudio C.
SrCO 3Walter Schumann , Gemstones of the world (2001) More from other references