Calcite on Dolomite    Grant Quarry, Greeley, Ontario, Canada.  Ex. Michael Walter collection.  This is a fine, domical example of these interesting calcites that measures 5.5 x 5 x 4.2 cm.  Large crystals stand up in various directions.  One crystal on backside is cleaved, otherwise in outstanding condition.  Great luster, form, and aesthetics.  $50