White, Reddish, gray, Brown, Brownish
Yellow, Brownish, Reddish, Green, Brownish, Yellow, Green, Yellow, Red
Subconchoidal, ConchoidalArthur Thomas, Gemstones (2009), Conchoidal, Brittle
Uneven
Na 3(Na,K)Al 4Si 4O 16Ulrich Henn and Claudio C.
(Fe+++,Al)25(PO4)17O6(OH)12•75(H2O)