Colorless, Yellow, Brown, Green, Colorless, Green, Yellow, Red, Reddish, Brown
Grey, Brown, Green, Colorless, White
Brittle, Metallic, Brittle, Metallic
UnevenArthur Thomas, Gemstones (2009), UnevenArthur Thomas, Gemstones (2009)
Ca(Mg,Al)3(Al3Si)O10(OH)2
Ca 2Mg 5Si 8O 22(OH) 2Ulrich Henn and Claudio C.