Conchoidal, Brittle, Conchoidal, Brittle, Conchoidal, Brittle
Uneven, Conchoidal, Brittle, Metallic, ConchoidalArthur Thomas, Gemstones (2009)
(Mg,Fe2+ ) 2(Mg,Fe2+ ) 5Si 8O 22(OH) 2Anthony et al , Handbook of mineralogy (2001)
Ca 3Cr 2(SiO 4) 3Ulrich Henn and Claudio C.