Calcite on Dolomite

A large distincly phantomed primary crystal envelopes a smaller crystal forming a penetration twin. They are perched on a shelf of dolomite sprinkled with irridescent chalcopyrites. The termination of the smaller crystal was a contact point, as evidenced by the completed growth but incomplete form.

Locality: Sweetwater (Milliken) Mine, Viburnum Trend District, Reynolds County MIssouri

Composition: Calcium Carbonate