Colorless, Yellow, Brownish, Red, Violet, Blue, gray
Blue, Red, Yellow, Colorless, Blue, Colorless, Green, Yellow, White, Blue, Colorless, Green, Yellow, White
Splintery, Conchoidal, Brittle
Uneven, Conchoidal, Brittle, Uneven, ConchoidalAnthony et al, Handbook of mineralogy (2001), Conchoidal, Brittle