Colorless, Yellow, Brown, Green, Colorless, Green, Yellow, Red, Reddish, Brown
White, Colorless, Blue, Red, Green, Yellow, Violet, pink
Brittle, Metallic, Brittle, Metallic
Conchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009), Brittle
Ca(Mg,Al)3(Al3Si)O10(OH)2
(Be,Cs) 3Al 2Si 6O 18 · 0.5H 2OUlrich Henn and Claudio C.