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Ferric-ferronyboite: NaNa2(Fe++)3(Fe+++)2(Si7Al)O22(OH)2
Comments: Black granular-prismatic masses of ferric-ferronyboite. Associated minerals are white albite and beige zircon. Location: Abdong (Aptong) Zr-Nb deposit, Pyonggang-gun, Kangwon Province, North Korea. Scale: Picture Size 12x10 mm. © Pavel M. Kartashov