andesite. Image courtesy of Dr. Anthony Cabo Lava cameos are simple, yet beautiful, monochrome cameos that date back to the seventeenth century. They are made of pyroclastic rock such as tuff or welded tuff or gray, brown, white or putty color igneous rock such as felsite, rhyolite, basalt, or andesite. These materials ar Queen, Bijoux, Antiques, Antique Jewelry, Faces, Edwardian Jewelry, Vintage Rhinestone, Antique, Antique Costume Jewelry