This is a nice large Black and White Ocean Jasper and Clear Quartz Sphere. It has hypnotic circular patterns with areas of polished drusy quartz. Very aesthetic. Ocean Jasper is also known as Moon Jewel Jasper or Orbicular Jasper. We had originally thought that Ocean Jasper was the result of a fossilized algae deposit, but it is actually volcanic in nature! According to the U.S.G.S., "Orbicular Jasper forms when a silica rich rhyolitic ash flow cools quickly. Quartz and feldspar crystallize in spherulites, radial aggregates of needle like crystals, that provide the interesting structure seen in this kind of jasper." The only known source location for Ocean Jasper is a remote area along the coast of Madagascar.