Fairdale Quarry (I-39 Quarry), Rochelle, Ogle Co., Illinois

5.1 x 5.2 x 4.9 cm
Largest crystal measures 1.2 cm across.
2 x 2 x 1.9 in

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An interesting specimen of Marcasite and Sphalerite crystals which have altered to limonite. The location is quite obscure and unusual, being a small gravel pit outside the town of Rochelle which I have driven by quite a few times when visiting a friend who lives just to the north (from whom the specimen was obtained).

Condition: Good

Flaws: Some of the Calcite crystals are cleaved.

This mineral is also found in the following galleries: Minerals From the United States | Sulfides and Sulfosalts | Pseudomorphs | Minerals Priced Between 25 and 49 Dollars