File:Geyserite (Holocene; Yellowstone, Wyoming, USA) 1.jpg
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Summary
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| Description |
English: Geyserite from the Holocene of Wyoming, USA. (plan view; ~6.3 centimeters across at its widest; vintage specimen purchased from an old collection)
"Geyserite" is the name given to siliceous mineral deposits in the vicinity of geysers. Such deposits are composed of opaline silica (SiO2·nH2O - hydrous silicon dioxide). Geyserite forms as opal precipitates from hot water evaporating in the splash and spray zones of geysers. Similar material called "siliceous sinter" forms as opal precipitates from hot spring or geyser runoff. "Geyserite" is actually siliceous sinter (despite what some may assert), but is a genetic term for siliceous sinter deposited specifically by geyser activity. The term "sinter" should not be used by itself, because there are three types of sinter: siliceous sinter, calcareous sinter, and ferrous sinter. The general term for geyserite and siliceous sinter is "opalite", a chemical sedimentary rock composed of opal. Geyserite is typically whitish gray to dark gray, has vitreous to dull luster, is porous and lightweight, and can be somewhat friable. In cross-section, it ranges from well laminated to poorly laminated. Precipitation surfaces typically range in morphology from relatively smooth to spiny to pustulose to nodulose. Locality: unrecorded / undisclosed site at Yellowstone, northwestern Wyoming, USA |
| Date | |
| Source | https://www.flickr.com/photos/47445767@N05/52734803413/ |
| Author | James St. John |
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/52734803413. It was reviewed on 9 March 2023 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 22:58, 9 March 2023 | | 2,920 × 1,945 (3.99 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/52734803413/ with UploadWizard |
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