White, Colorless, gray
Colorless, Colorless, Violet, White
Uneven, Uneven, ConchoidalAnthony et al, Handbook of mineralogy (2001), Brittle
Uneven, Uneven, ConchoidalArthur Thomas, Gemstones (2009), Conchoidal, Brittle
Ca 9(Mg,Fe2+ )(PO 4) 6(PO 3OH)Anthony et al , Handbook of mineralogy (2001)
Ca 3Al 2(SO 4)(F,OH) 10Ulrich Henn and Claudio C.