Other than increased pressure, geysers and hot springs tend to get superheated because of dissolved mineral matter which builds deposits of as some of the water boils away leaving supersaturated brines.

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Geysers and hot springs often become superheated and form deposits due to the evaporation and boiling away of water, which leaves behind supersaturated brines. These conditions are conducive to the formation of calcareous tufa (travertine) and siliceous sinter (geyserite), which are common deposits around these thermal features.

Other Than Increased Pressure, Geysers and Hot Springs Tend to Get