Colorful material that forms in thundereggs from Chihuahua, Mexico. Technically, it is a rhyolite and takes an exceptional polish. Set in a silver colored cast brass belt buckle, it will fit a 35 mm or 40 mm (1.25″ or 1.5″) wide belt. Size – 40 mm high x 60 mm wide (1.52″ x 2.45″). Weight – 64.23 grams. Artist – John Delong