An antique native American Celt tool, early 19th century. A remarkable Celt, hand carved from a mottled dark brown stone with light brown inclusions. Celts are made of various types of stone, usually from igneous or metamorphic rocks, although sometimes softer stones such as limestone, sandstone or others were used. The stone was chiseled to give the product a rough shape, which was eventually processed by hand grinding and leveling the surface with a suitable abrasive stone. Ancient Pre Columbian Stone Tools And Historical Collectibles. Ancient Pre Columbian Stone Tools And Historical Collectibles.