Marcasite, Galena
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Marcasite on galena, 8 cm, from the Knautz farm estate, West Galena Township, Jo Daviess County, Illinois. Steve Bussan photo.
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Mineral guide
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orthorhombic dimorph of pyrite with cockscomb blade clusters, metallic luster and iridescent tarnish; prized for sculptural form yet requires caref…Regional guide
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