White, Reddish, gray, Brown, Brownish
Colorless, White, Brownish, Reddish, Black, Brownish, Black, Colorless, gray, White, Reddish, Brown
Subconchoidal, ConchoidalArthur Thomas, Gemstones (2009), Conchoidal, Brittle
Uneven
Na 3(Na,K)Al 4Si 4O 16Ulrich Henn and Claudio C.
Na 3AlF 6Ulrich Henn and Claudio C.