Dolomite, Calcite, Barite on Quartz - Monroe Reservoir spillway, USA - see ruler for scale; the larger example is 23 cm with a 13 cm cavity

Mineral: Dolomite, Calcite, Barite on Quartz
Locality: Monroe Reservoir spillway, Monroe County, Indiana, USA
Dimensions: see ruler for scale; the larger example is 23 cm with a 13 cm cavity

Description: multicolored dolomite, calcite, and minor Baryte all on quartz