Colorless, Yellow, Brown, Green, Colorless, Green, Yellow, Red, Reddish, Brown
Colorless, Green, Black, Brown, Red, Greenish, Yellow, gray
Brittle, Metallic, Brittle, Metallic
Conchoidal, Uneven, Conchoidal, Brittle, ConchoidalArthur Thomas, Gemstones (2009)
Ca(Mg,Al)3(Al3Si)O10(OH)2
Ca 3Fe 2(SiO 4) 3Arthur Thomas , Gemstones (2009)