Uneven, Uneven, ConchoidalAnthony et al, Handbook of mineralogy (2001)
Sub-Conchoidal, Irregular/uneven, Sub-Conchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009)
Ca 2 MgAl 2 BSi 4 O 15 OH Gemdat.org, Management Team (2012)
(Li,Na)Al(PO 4)(F,OH)Michael OâDonoghue , Gems, Sixth edition (2006) More from other references