VOLUME 38 • NUMBER 3 $15 Wayne & Dona Leicht, 875 North Pacific Coast Highway, Laguna Beach, CA 92651 (949)...Cooper Nottingham, England Anthony R. Kampf L.A. County Mus. of Nat. Hist. Los Angeles, CA Joseph A. Mandarino... on calcite, from the El Oriente tunnel, Chivor mine, Boyaca, Colombia. William Larson collection; Van...volume. Commonly the geodes contain heulandite and quartz, and rarely also mordenite, stilbite and calcite...crystallization of quartz also took place; thus white, spheroidal aggregates of quartz can be found in the |