UnevenAnthony et al, Handbook of mineralogy (2001) More from other references, UnevenAnthony et al, Handbook of mineralogy (2001) More from other references, Brittle, Metallic
Irregular/uneven, UnevenArthur Thomas, Gemstones (2009)
CoAsSAnthony et al , Handbook of mineralogy (2001)
CaAl 2Si 4O 12 -6H 2OArthur Thomas , Gemstones (2009)