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Armbrusterite: K5Na6Mn+++Mn++14[Si9O22]4(OH)10·4H2O
Comments: Translucent yellow-brown crystals of armbrusterite on small fragment of brown matrix. Location: Kirovskii Mine, Mt. Kukisvumchorr, Khibiny, Kola Peninsula, Russia. Scale: Specimen Size 5x3x2 mm. © John Betts - Fine Minerals
Comments: SEM image of a spherulite of platy crystals of armbrusterite (2 mm diameter) on cancrinite and calcite. (AmMin, v92:416). Location: Khibiny massif, Kola Peninsula, Russia.. Scale: Spherulite Size 2 mm. © American Mineralogist