Colorless, White, Brownish, Reddish, Black, Brownish, Black, Colorless, gray, White, Reddish, Brown
Colorless, White, Yellow, Green, White, pink, Green, Yellow, Violet, White, pink, Green, Yellow, Violet
Uneven
Uneven, Brittle, Uneven, Brittle, Uneven
Na 3AlF 6Ulrich Henn and Claudio C.
(K,Na)Ca4Si8O20(F,OH)•8(H2O)