Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Brittle
Uneven, Conchoidal, Uneven, Irregular, Conchoidal, Management Team (2012)
Al 6B 5O 15(F,OH) 3Ulrich Henn and Claudio C.
Na(Li 1.5Al 1.5)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012) Formula given for elbaite.