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).
SiO 2Ulrich Henn and Claudio C.
FeO(OH)Arthur Thomas , Gemstones (2009)