Uneven, Uneven, ConchoidalArthur Thomas, Gemstones (2009), Conchoidal, Brittle
Uneven, Subconchoidal, Uneven, Subconchoidal, Conchoidal, Brittle
Ca 3Al 2(SO 4)(F,OH) 10Ulrich Henn and Claudio C.
NaAlSi 2O 6 · H 2OMichael OâDonoghue , Gems, Sixth edition (2006) More from other references