A large, 4.5 cm, textbook, nearly transparent, colorless calcite rhomb is aesthetically set in bornite-rich sulfide ore and accented with highly lustrous, distorted pyrite cubes. The calcite is included with an unknown mineral and there are even scattered clusters of green byssolite hairs. Classic and excellent combination material from the mines at Concepcion del Oro, Mexico. Ex. Consie Prince Collection.