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Manganoneptunite: KNa2Li(Mn,Fe++)2Ti2Si8O24
Comments: Dark brown crystal of mangan-neptunite on matrix. Location: Kibblehouse quarry, Perkiomenville, Pennsylvania, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Manganoneptunite: KNa2Li(Mn,Fe++)2Ti2Si8O24 Shkatulkalite: {(Na,Mn,Ca,[ ])4[Nb2(O,H2O)4Si4O14](OH,F)2}·2(H2O,[ ])
Comments: Pearly white shkatulkalite with brown mangan-neptunite grains. Location: Shkatulka pegmatite, Umbozero mine, Alluaiv Mt, Lovozero Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia. Scale: Picture size 4.5 mm. © Thomas Witzke / Abraxas-Verlag