Colorless, Yellow, Brown, Green, Colorless, Green, Yellow, Red, Reddish, Brown
Yellow, Greenish, Brownish, Colorless, White, gray, Yellow, Green, Blue, Violet, Blue, Colorless, Green, gray, Yellow, Blue, Colorless, Green, gray, Yellow, orange
Brittle, Metallic, Brittle, Metallic
Conchoidal, Brittle, Conchoidal, Brittle, Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Brittle, Conchoidal
Ca(Mg,Al)3(Al3Si)O10(OH)2
PbSO 4Michael OâDonoghue , Gems, Sixth edition (2006) More from other references