File:Opalized fluorite (Thomas Range, Utah, USA) 1.jpg
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| Description |
English: This is "bertrandite", or "Tiffany stone". Bertrandite is a beryllium hydroxy-silicate mineral (Be4Si2O7(OH2)) (see: www.mindat.org/min-642.html), but this rock is not composed of that material. True bertrandite can be present, but the rock is (apparently) principally a mix of fluorite (CaF2 - calcium fluoride) and common opal (SiO2·nH2O - hydrous silica). Chalcedony (quartz) is often cited as being present. Tiffany stone started out as upper Tertiary volcanic rocks that have been altered by beryllium and fluorine mineralization. Brecciation textures are frequently present.
Tiffany stone is classically from the Brush Wellman Beryllium Mine in western Utah, but the material has also been recovered from nearby small sites. Locality; unrecorded/undisclosed site at or near the Brush Wellman Beryllium Mine, Topaz-Spor Mountains (Thomas Range), Juab County, western Utah, USA |
| Date | |
| Source | https://www.flickr.com/photos/47445767@N05/34155347690/ |
| Author | James St. John |
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This file is licensed under the Creative Commons Attribution 2.0 Generic license.
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/34155347690. It was reviewed on 19 November 2020 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 | 20:49, 19 November 2020 | | 2,584 × 2,630 (4.17 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/34155347690/ with UploadWizard |
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