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 2 (with trace Cr minerals) Gemdat.org , Management Team (2012)
FeO(OH)Arthur Thomas , Gemstones (2009)