jasper/agate pendant in bare copper wire

I don't exactly know what to call this stone but it looks like a jasper with agate in it. When I work with stones, I pick up small pieces to shape and polish and won't actually know where it comes from, so it's tough to ID. It is a lovely brownish/orange tone with the copper, wrapped simply with an elegant finish. The necklace is a black waxed cotton cord that slips over your head, and is knotted to be adjustable in length.