Calcite, Quartz, Dolomite

This specimen is covered in white, saddle-shaped dolomite crystals, with a surface coating of clear micro quartz and a cluster of yellow doubly-terminated calcite near the top of the matrix. It originates from the Sainte-Clotilde quarry (formerly Marcil quarry) near Sainte-Clotilde-De-Châteauguay, Montérégie, Québec, a site now closed to collectors. The quarry operated between 1980 and 2008 in the dolomitic limestone of the Beekmantown Formation. During the 1990s, large cavities in the quarry yielded superb calcite and quartz specimens. The locality was also known for producing excellent pyrite, chalcopyrite, anatase, sphalerite, barite, and occasional secondary copper minerals.