White, Colorless, Blue, Red, Green, Yellow, Violet
Colorless, Green, Black, Brown, Red, Greenish, Yellow, gray
Not Available
Conchoidal, Uneven, Conchoidal, Brittle, ConchoidalArthur Thomas, Gemstones (2009)
SiO 2 (with trace Cr minerals) Gemdat.org , Management Team (2012)
Ca 3Fe 2(SiO 4) 3Arthur Thomas , Gemstones (2009)