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Gjerdingenite-Na: (K,Na)2Na(Nb,Ti)4(Si4O12)2(OH,O)4·5H2O
Comments: Pseudomorphs of gjerdingenite-Na (Gje) after vuonnemite with eudialyte and two generations of aegirine (right part of the specimen). (CanMin, v45:529). Location: Mont Saint-Hilaire, Quebec, Canada. Scale: Specimen Size 8 cm. © P. Tarassoff / Canadian Mineralogist