Crystal Geyser is located on the east bank of the Green River approximately 4.5 miles (7.25 km) downstream from Green River, Utah. It is a rare example of a cold water carbon dioxide driven geyser; geothermal activity does not play a role in the activity of the geyser. The ground water near the geyser has significant quantities of dissolved carbon dioxide, along with substantial underground gas accumulations in the surrounding area. Saturation of the aquifer with creates enough pressure to force groundwater through the geyser and out on to the surface. - Source: Wikipedia