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Veins of pyrite in nodule of apatite var. phosphorite, from Clay Pits, Friedland, Neubrandenburg, Germany.  8.7 x 7.7 x 3.5 cm.  The pyrite is iridescent and forms wonderful patterns in the nodule. (Author: Tracy)

Veins of pyrite in nodule of apatite var. phosphorite, from Clay Pits, Friedland, Neubrandenburg, Germany. 8.7 x 7.7 x 3.5 cm. The pyrite is iridescent and forms wonderful patterns in the nodule. (Author: Tracy)

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