One of the mysteries of the English language finally explained.
A hard opaline siliceous deposit occurring around geysers and hot springs.
- ‘The temperature of the water is not high enough to form geyserite.’
- ‘The cliffs rising like cones are made up of sheet layers of hydroquarzite, silicic limestone and mass geyserite.’
- ‘The crust of geyserite is thin in places and if walked on can break through.’
- ‘The accumulated geyserite constituted small, cone-shaped hills here and there, which are called geyser cones today.’
- ‘Over hundreds of years, the geyserite builds up.’
Early 19th century: from geyser + -ite.
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