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