Nearby White Dome Geyser, which erupts considerably more frequently ( albeit less powerfully ) from a large geyserite cone, is easily seen from the same parking lot that affords a viewpoint for Great Fountain.
12.
As a result, most geysers form in places where there is volcanic rhyolite rock which dissolves in hot water and forms mineral deposits called siliceous sinter, or geyserite, along the inside of the plumbing systems which are very slender.
13.
There are two types of geysers : " fountain geysers " which erupt from pools of water, typically in a series of intense, even violent, bursts; and " cone geysers " which erupt from cones or mounds of siliceous sinter ( including geyserite ), usually in steady jets that last anywhere from a few seconds to several minutes.
