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Voronkovite: Na15(Na,Ca,Ce)3(Mn,Ca)3Fe3Zr3Si26O72(OH,O)4Cl·H2O
Comments: Brownish red cleavage fragment of voronkovite. Location: Alluaiv Mt., Lovozero Massif, Kola Peninsula, Russia. Scale: Specimen Size 5 x 2 mm. © Sergey Vasiliev / Systematic Mineralogy