the geyser with rocks in an effort to provoke eruptions. The first written record of Crystal Geyser comes from the report of the Powell Geographic Expedition of 1869, July 13, 1869: We stop to examine some interesting rocks, deposited by mineral springs that at one time must have existed here, but which are no longer flowing...GeologyThe area surrounding the modern geyser is covered in a thick layer of orange travertine. The travertine is composed of couplets of highly porous, micritic laminae alternating with iron oxide-rich laminae. Aragonite is present near the vent and is replaced by magnesium-poor calcite farther away. The bacterium Leptothrix is probably responsible for the Frutexites‐like iron-rich laminae. Pisoids ("pearls") form in pools near the vent. Source of the water is the nearby Green River, which flows along the Little Grand Wash Fault and dissolves the calcium carbonate from the underlying Middle Jurassic strata, particularly the Summerville Formation. The average geyser water temperature is 18°C (64.4 F). See also List of geysers Soda Springs, Idaho Travertine Wirthbacteria References External links Cold Water Geysers (Crystal Geyser, Utah) Implications of results from flux surveys over known systems for long-term monitoring Bodies of water of Grand County, Utah Geysers of Utah Cold water geysers Tourist attractions in Grand County, Utah