Botryoidal Spring
Botryoidal Spring is a fountain-type geyser in the Lower Geyser Basin of Yellowstone National Park in the United States.Botryoidal Spring is part of the White Creek Group, which includes A-0 Geyser and Spindle Geyser.The term botryoidal refers to the subspherical, grape-like geyserite structures around the vent.With no warning, eruptions start with a broad, moderately noisy burst.Eruptions may start with a blue bubble, caused by a large steam bubble rising from below the water surface.