White, Pale pink, Colorless, pink, Yellow
White, Colorless, Blue, Red, Green, Yellow, Violet
Not Available
ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009)
Mn2+ BO 2(OH)Anthony et al , Handbook of mineralogy (2001)
SiO 2Ulrich Henn and Claudio C.