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Fianelite: Mn++2V+++++(V+++++,As+++++)O7·2(H2O)
Comments: Small reddish-brown inclusions of fianelite in matrix. Location: Fianel Mine, Val Ferrera, Grischun (Grisons; Graubünden), Switzerland. Scale: Picture size 1 mm. © Thomas Witzke / Abraxas-Verlag