Calcite with Chalcopyrite

A cluster of doubly terminated prismatic Calcites to 4.5cm cemented together by a multitude of clustered Chalcopyrites. The dominant Calcite has an unusual termination which likely was caused by interference growth but continued to develop after the specimen was dislodged. Ex Mike Wortham

Locality: Sweetwater Mine, Viburnum Trend, Reynolds County, Missouri

Composition: calcium carbonate and copper iron sulfide

Composition: calcium carbonate