Uneven, Uneven, ConchoidalAnthony et al, Handbook of mineralogy (2001)
Uneven, Uneven, Gems, Sixth Edition (2006), Uneven, Conchoidal
Ca 2 MgAl 2 BSi 4 O 15 OH Gemdat.org, Management Team (2012)
NaAlSi 3O 8Michael OâDonoghue , Gems, Sixth Edition (2006)