Conchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009)
UnevenAnthony et al, Handbook of mineralogy (2001) More from other references, UnevenAnthony et al, Handbook of mineralogy (2001) More from other references, Brittle, Metallic
(Mg,Fe2+ )Al 2O 4Gemdat.org , Management Team (2012) More from other references
CoAsSAnthony et al , Handbook of mineralogy (2001)