Calcite

This little killer clearly developed in onion-like stages. The external “shell” covers half the piece and is comprised of tight aggregations of calcites with what is likely boulangerite veins. Inside, 6 spheres developed, the largest being 2.5cm. Pseudomorphism and epimorphs are not uncommon, and this could have alteration by any number of carbonates. Ex Kenny Gay collection.

Locality: Boldut Mine, Cavnic, Maramures County, Romania

Composition: calcium carbonate