Uneven, Uneven, Gemstones of the world (2001) More from other references
Uneven, Conchoidal, Brittle, Metallic, ConchoidalArthur Thomas, Gemstones (2009)
Ca 10Mg 2Al 4(SiO 4) 5(Si 2O 7) 2(OH) 4Ulrich Henn and Claudio C.
Ca 3Cr 2(SiO 4) 3Ulrich Henn and Claudio C.