ConchoidalAnthony et al, Handbook of mineralogy (2001), ConchoidalAnthony et al, Handbook of mineralogy (2001), Brittle, Conchoidal
Uneven, Uneven, ConchoidalGemdat.org, Management Team (2012)
SbTaO 4Ulrich Henn and Claudio C.
Mn 3Al 2(SiO 4) 3Arthur Thomas , Gemstones (2009)