Colorless, Green, Black, Brown, Red, Greenish, Yellow, gray
White, Pale pink, Colorless, pink, Yellow
Conchoidal, Uneven, Conchoidal, Brittle, ConchoidalArthur Thomas, Gemstones (2009)
Not Available
Ca 3Fe 2(SiO 4) 3Arthur Thomas , Gemstones (2009)
Mn2+ BO 2(OH)Anthony et al , Handbook of mineralogy (2001)