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Ferritaramite: Na(CaNa)(Fe++,Mg)3Fe+++2[Si6Al2O22](OH)2 Potassic-ferritaramite:
Comments: Lightly to moderately etched, blocky, jet black ferritaramite (potassic-ferritaramite is a not approved mineral name). Location: Niaslo, Basha Valley, Baltistan, Pakistan. Scale: 5 x 1.5 x 0.3 cm. © John Veevaert