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Ardennite-(As): (Mn++,Ca,Mg)4(Al,Mg,Fe)6(SiO4)2(Si3O10)(AsO4,VO4)(OH)6
Comments: Yellow ardennite crystals in white quartz matrix. Location: Salmchâteau, Vielsalm, Stavelot Massif, Ardennes, Luxembourg Province, Belgium. Scale: 30x20x17 mm. © John Betts - Fine Minerals