Black, Brownish, White, Brown
Black, Colorless, Green, Violet, White, Yellow, White, Colorless, Blue, Red, Green, Yellow, pink, Brown, Colorless, Violet, gray, Yellow
Not Available
Taurus, Capricorn, Sagittarius, Capricorn, Sagittarius
Conchoidal, Brittle
Conchoidal, Conchoidal, Brittle, Gems
(Mn2+ ,Fe2+ ,Mg)(Fe3+ ,Mn3+ ) 2O 4Anthony et al , Handbook of mineralogy (2001)
SiO2