Marcasite crystals (up to 3mm in size) cover a double sided plate of sharp dog-tooth calcite on this specimen from the Grant Quarry, in Gloucester County.
The quarry is part of the Beekmantown Formation that shows up at several locations, From Saratoga Springs NY, through Herkimer NY, St-Clothilde Quebec, St-Eustache Quebec to Greely Ontario.
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