Brittle, Metallic, Brittle, Metallic
Uneven, Conchoidal, Uneven, Irregular, Conchoidal, Management Team (2012)
Na 2ZrSi 3O 9 · 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
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.