Conchoidal, Brittle, Conchoidal, Brittle, Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Brittle, Conchoidal
Uneven, Uneven, ConchoidalGemdat.org, Management Team (2012)
Fe 3Al 2(SiO 4) 3Arthur Thomas , Gemstones (2009)
Mn 3Al 2(SiO 4) 3Arthur Thomas , Gemstones (2009)