Puff 'n' Stuff Geyser makes a lot of noise, but the eruptions are only a few feet high and often send a fine mist down the boardwalk after you. Around the fissure, there is often a build-up of a light grey-blue clay, perhaps formed by the interaction of the underlying rock with the hot mineral-rich waters erupting from the vent.
From lyall.tripod.com/geysers/id10.html
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