Black, Colorless, Green, Violet, White, 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
Gems, Sixth Edition (2006)
Uneven, UnevenArthur Thomas, Gemstones (2009)
Quartz: SiO2 Rutile: TiO2
KCa 4Si 8O 20(F,OH) · 8H 2OUlrich Henn and Claudio C.