Yellow, Red, Reddish, Brown, Colorless, White, Yellow, Red, Reddish, Brown, Colorless, White, gray, White, gray, Reddish, White, gray, Reddish, White, gray, Reddish
Blue, Greenish, Violet
Conchoidal, Uneven
Uneven, UnevenArthur Thomas, Gemstones (2009), Conchoidal, Brittle
KAl3(SO4)2(OH)6
(Na,Ca) 8Al 6Si 6O 24(SO 4,S,Cl) 2Ulrich Henn and Claudio C.