Blue, gray, Black, Blue
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)
[ ]Na2(Mg3Al2)Si8O22(OH)2
KCa 4Si 8O 20(F,OH) · 8H 2OUlrich Henn and Claudio C.