Agate is the banded form of the mineral Chalcedony, which is a microcrystalline variety of Quartz. Agate is the most varied and popular type of Chalcedony, having many varieties on its own. Photo by Darwin Dillon.
cabochon of Mohave purple turquoise. It is composed of small chunks of natural blue turquoise, to which they added red dye and a brassy-bronze metallic. Beautifully rich coloration, with plenty of contras