A rare and superb Mexican example of copper included inside and on water-clear calcite scalenohedrons from the much less well-known Bufa Mine of Chihuahua. All of the calcite crystals are pristine and if you look down into the crystals, you can see the bright copper inside. The arborescent clusters of spinel-twinned, nicely burnished copper crystals really add character to an outstanding specimen of major interest from a historic find. This looks just like an excellent Onganja copper in calcite, but its not. Ex. Jaime Bird Collection.