geyserite


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gey·ser·ite

 (gī′zə-rīt′)
n.
A white or grayish opaline siliceous deposit formed around natural hot springs.

geyserite

(ˈɡiːzəˌraɪt)
n
(Minerals) a mineral form of hydrated silica resembling opal, deposited from the waters of geysers and hot springs. Formula: SiO2.nH2O
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References in periodicals archive ?
They interpreted the deposits were formed on land, not in the ocean, by identifying the presence of geyserite - a mineral deposit formed from near boiling temperature silica-rich fluids - that is only found in a terrestrial hot spring environment.
They interpreted the deposits were formed on land, not in the ocean, by identifying the presence of geyserite - a mineral deposit formed from near boiling-temperature, silica-rich, fluids that is only found in a terrestrial hot spring environment.
Ghostly hot springs at Hveravellir in Iceland overflow on to terraces of geyserite.