Mineral: Pyrite
Locality: Spring Creek, Alden, Erie County, New York, USA
Dimensions: 1.6 cm

Description: These pyrite nodules have been in my collection for 60+ years. They are said to be susceptible to "pyrite disease" but these show no noticeable decomposition. Originally identified as marcasite, x-ray diffraction studies at the State University of New York have shown they are pyrite. No marcasite occurs at this old locality.

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