Uneven, Conchoidal, Brittle
Uneven, Subconchoidal, Uneven, Subconchoidal, Conchoidal, Brittle
Ca(Mg 3)MgAl 5(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)
NaAlSi 2O 6 · H 2OMichael OâDonoghue , Gems, Sixth edition (2006) More from other references