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See Blue Star Spring, Upper Geyser Basin, Yellowstone National Park, Wyoming

Blue Star Spring is a clear, deep, blue pool surrounded by a rim of solidified sinter that forms a shape that slightly resembles a star shape with linear 'arms' extending from the center of the pool. One of these 'arms' is a runoff channel from the pool. Minimal thermophiles are observed due to the high heat of the water. While Blue Star Spring has been known to erupt, it has not had a recorded eruption since 2002. Blue Star Spring has an average temperate of 190.7°F (88.2°C), an average pH of 8.9, and an average conductivity of 1866 uS/cm.
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