White, Colorless, Blue, Red, Green, Yellow, Violet
Yellow, Greenish, Brownish, Colorless, White, gray, Green, Blue, Violet, orange
ConchoidalArthur Thomas, Gemstones (2009)
Conchoidal, Brittle, ConchoidalArthur Thomas, Gemstones (2009)
SiO 2 + H 2OUlrich Henn and Claudio C.
PbSO 4Michael OâDonoghue , Gems, Sixth edition (2006) More from other references