Colorless, Green, Black, Brown, Red, Greenish, Yellow, gray
Colorless, White, Brownish, Reddish, Black, Brownish, Black, Colorless, gray, White, Reddish, Brown
Conchoidal, Uneven, Conchoidal, Brittle, ConchoidalArthur Thomas, Gemstones (2009)
Uneven
Ca 3Fe 2(SiO 4) 3Arthur Thomas , Gemstones (2009)
Na 3AlF 6Ulrich Henn and Claudio C.