ConchoidalAnthony et al, Handbook of mineralogy (2001), ConchoidalAnthony et al, Handbook of mineralogy (2001), Brittle, Conchoidal
UnevenArthur Thomas, Gemstones (2009), UnevenArthur Thomas, Gemstones (2009)
SbTaO 4Ulrich Henn and Claudio C.
(Al,Mn3+ ) 2SiO 4OGemdat.org , Management Team (2012)