Interesting bipyramidal pyrite crystals, somewhat altered to brown goethite (although you can see some original pyrite peeking through on the edges) on calcite from Pint’s Quarry, Raymond, Black Hawk Co., Iowa, USA. The main cluster of crystals is 7mm across.

1455 Pyrite, Pint's Quarry, Raymond, Black Hawk Co., Iowa, USA

1455 Pyrite, Pint’s Quarry, Raymond, Black Hawk Co., Iowa, USA – Click on image for a full-sized version.

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