Uneven, Brittle, Metallic, Brittle, Metallic
Uneven, Conchoidal, Uneven, Irregular, Conchoidal, Management Team (2012)
NaNa2(Fe++4Fe+++)Si8O22(OH)2
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.