White, Colorless, Blue, Red, Green, Yellow, Violet
White, Colorless, Blue, Red, Green, Yellow, Violet
ConchoidalArthur Thomas, Gemstones (2009)
Uneven, Gems, Sixth Edition (2006)
SiO 2 + H 2OUlrich Henn and Claudio C.
Al 2O 3Michael OâDonoghue , Gems, Sixth Edition (2006)