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Kalifersite: (K,Na)5Fe+++7Si20O50(OH)6·12(H2O)
Comments: Brownish-red crystalline granular aggregates of kalifersite in rock matrix composed of fibers to 5mm. Location: Mt. Rasvumchorr, Khibiny massif, Kola Peninsula, Russia. Scale: Specimen size 3.5 x 2 x 1.5cm. © Tom Loomis / Dakota Matrix