Colorless, White, Blue, Yellow, Grey, Brown, Colorless, White, Blue, Yellow, Grey, Brown
White, Colorless, Blue, Red, Green, Yellow, Violet, Black, Green, Red, Blue, White
Irregular/uneven
Uneven, Uneven, Irregular, ConchoidalAnthony et al, Handbook of mineralogy (2001), Conchoidal, Brittle