File:Emerald Spring (9 August 2011).jpg

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English: Emerald Spring, northern Back Basin, central Norris Geyser Basin, Yellowstone Hotspot, northwestern Wyoming, USA on 9 August 2011 (looking ~WSW).

This 25 to 30 feet deep pool has occasional geyser eruptions, but is usually a gently overflowing hot spring. The water is acidic and near-boiling to superheated. The intense green color is a combination of blue, colloidal silica-rich water (seen in many, very hot pools throughout Yellowstone) and yellow-colored elemental sulfur (S) lining the floor and walls of the pool. A thin border of whitish-colored siliceous sinter, composed of opal (SiO2·nH2O - hydrous silica), encircles the pool.

A rising stream of bubbles near the center of Emerald Spring consists of water vapor (H2O), carbon dioxide (CO2), plus other gases. A whitish- to grayish-colored, siliceous sinter-lined runoff channel heads southwest from Emerald Spring (see upper left of photo), merges with Monarch Geyser’s runoff channel, and eventually drains into Tantalus Creek.

In the early 1930s, Emerald Spring had significant and frequent geyser eruptions up to about 80 feet high.

During the annual Norris Geyser Basin disturbances, Emerald Spring becomes muddy (= suspended fine-grained sediments) and has relatively small geyser eruptions about 6 feet high or less.
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Source https://www.flickr.com/photos/47445767@N05/8272368931/
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@N05/8272368931. It was reviewed on 30 October 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

30 October 2020

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current19:37, 30 October 2020Thumbnail for version as of 19:37, 30 October 2020960 × 533 (332 KB)Ser Amantio di Nicolao (talk | contribs)Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/8272368931/ with UploadWizard

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