Conchoidal, ConchoidalArthur Thomas, Gemstones (2009)
Uneven, Uneven, ConchoidalGemdat.org, Management Team (2012)
(Ca,Fe,Mn,Mg) 3Al 2BSi 4O 15(OH)Walter Schumann , Gemstones of the world (2001) More from other references
Mn 3Al 2(SiO 4) 3Arthur Thomas , Gemstones (2009)