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Natrodufrenite: Na(Fe+++,Fe++)(Fe+++,Al)5(PO4)4(OH)6·2(H2O)
Comments: Greenish gray, botryoidal aggregates natrodufrenite on hematite-stained quartz. Location: Greifenstein Rocks, Ehrenfriedersdorf, Erzgebirge, Saxony, Germany. Scale: Picture size 5 mm. © Thomas Witzke / Abraxas-Verlag