Colorless, White, Yellow, White, Greenish, gray, Brown, Colorless, Yellow
Colorless, Reddish, White, pink, Green, Yellow, Violet, White, pink, Green, Yellow, Violet, White, Colorless, Blue, Green, Brown, Yellow, pink, Violet, White, pink, Green, Yellow, Violet
Conchoidal, Brittle, Conchoidal
Uneven, UnevenArthur Thomas, Gemstones (2009)
AlO(OH)Walter Schumann , Gemstones of the world (2001) More from other references
KCa 4Si 8O 20(F,OH) · 8H 2OUlrich Henn and Claudio C.