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Natronambulite: (Na,Li)Mn++4[Si5O14(OH)]
Comments: Thin section image of natronamulite (Nn) in assocation with aegirine (Ac), arfvedsonite (Am) and quartz (Q). (JMPS, v12:332). Location: Tanohata mine, Iwate Prefecture, Japan. Scale: Picture Size 1.9 x 1.5 mm. © Mineralogical Journal