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Elpidite: Na2ZrSi6O15·3(H2O) Gjerdingenite-Mn: (K,Na)2(Mn,Fe)(Nb,Ti)4(Si4O12)2(O,OH)4·6(H2O)
Comments: Golden brown crystal of gjerdingenite-Mn, in white elpidite. Location: Gjerdingselva (Gjerdingen), Nordmarka, Lunner, Oppland, Norway. Scale: Crystal Size 0.02 cm. © Jeff Weissman / Photographic Guide to Mineral Species
Elpidite: Na2ZrSi6O15·3(H2O)
Comments: Blocky, intergrown crystals of elpidite. Location: Narsasuk, Greenland. Scale: Crystal size 2 cm. © John Veevaert