Franklin ore composed of black franklinite and gray willemite is cut by a composite vein comprised of veinlets of willemite (light gray, and white), rhodochrosite (white at lower left), and an impure mixture containing carbonate minerals (dark gray). The visible surface is polished, Specimen is 10 cm in maximum dimension. Smithsonian Institution, #C6603. Photo by the author.
67.70cts NATURAL SUPERB DESIGNER RHODOCHROSITE PEAR CABOCHON GEMSTONE AFRICA