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Pyrite-Siderite Filón Norte, Tharsis, Alosno, Huelva, Spain May be not very interesting for the typical mineral collector, but this kind of mineral, called "carbonate ore" and formed by alternating layers of siderite and pyrite, is one of the most interesting minerals to be found in Filón Norte open pit. (Author: Cesar M. Salvan)

Pyrite-Siderite
Filón Norte, Tharsis, Alosno, Huelva, Spain
May be not very interesting for the typical mineral collector, but this kind of mineral, called "carbonate ore" and formed by alternating layers of siderite and pyrite, is one of the most interesting minerals to be found in Filón Norte open pit. (Author: Cesar M. Salvan)

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