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Updated: May 24, 2025
The geyser-waters hold large quantities of silica and sulphur in solution, owing to their high temperature under great pressure, and these minerals are precipitated upon the cooling of the waters in the air, and form circular basins, often gorgeously tinted with red and yellow colours. J. W. Powell, Exploration of the Cañons of the Colorado, pp. 114, 196.
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