UnevenArthur Thomas, Gemstones (2009), UnevenArthur Thomas, Gemstones (2009)
UnevenArthur Thomas, Gemstones (2009), UnevenArthur Thomas, Gemstones (2009), Conchoidal, Brittle
{110} Perfect, {110} Perfect
Perfect on {110} at 56° and 124°; partings on {010} and {100}
(Fe,Mn) 7Si 7O 21Ulrich Henn and Claudio C.
Ca 2Mg 5Si 8O 22(OH) 2Ulrich Henn and Claudio C.