White, Colorless, Blue, Red, Green, Yellow, Violet
Brown, Brown, Reddish, Brownish, Yellow, Brown, Reddish, Brownish, Yellow
Not Available
Uneven, torn surfaces, (e.g. fractured metals)., Uneven, Gemstones (2009), torn surfaces, (e.g. fractured metals).
CaF 2Michael OâDonoghue , Gems, Sixth Edition (2006)
FeO(OH)Arthur Thomas , Gemstones (2009)