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Description
Pacific Ring of Fire Expedition. Photograph shows a piece of one of the chimneyspires in the next image. It has been cut in half and is 22 cm long.The interior of the chimney is lined by a copper-rich mineral, chalcopyrite.The gray and white zone near the exterior of the chimney is composed ofiron, zinc and barium-rich minerals called pyrite, sphalerite and barite. (Image credit: Pacific Ring of Fire 2004 Expedition. NOAA Office of Ocean Exploration; Dr. Bob Embley, NOAA PMEL, Chief Scientist)