Definition of "geyserite" []

• A white or grayish opaline siliceous deposit formed around natural hot springs. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "It is located in the Upper Geyser Basin, and is situated on a mound of geyserite built by its own water."
• "But there is no mound, and the rocks of the fissure are just beginning to get a coating of the silicious geyserite deposited from the water, so that it cannot long have been spouting."
• "They come nearer in character to the Yellowstone geysers, their waters depositing true geyserite, or silicious concretions."