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Grattarolaite: Fe+++3O3(PO4) Rodolicoite: Fe+++PO4
Comments: Brown grattarolaite, intimately intergrown with brown rodolicoite. Location: Castelnuovo Mine, Santa Barbara lignite district, San Giovanni Valdarno, Valdarno (Val d'Arno), Arezzo Province, Tuscany, Italy. Scale: Picture size 4 mm. © Thomas Witzke / Abraxas-Verlag