File:Blue chalcedony (Fontenelle Reservoir, northeast of Kemmerer, Wyoming, USA) (32437936397).jpg
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Blue chalcedony from Wyoming, USA. (tumble-polished; ~5.2 centimeters across at its widest) Chalcedony is a "variety" of quartz, the most common silicate mineral in Earth's crust. Quartz is ~pure silica - SiO2. It has a nonmetallic luster, can be any color, has a white streak, a hardness of 7 on the Mohs Hardness Scale, forms hexagonal crystals, has no cleavage, and breaks with conchoidal fracture. Chalcedony is finely-crystalline, translucent, fibrous quartz. It often forms irregularly concentric layers. Many geodes are lined with chalcedony, on top of which are usually large quartz crystals. Agate is another "variety" of quartz - it consists of chalcedony. The specimen shown here is an attractive blue chalcedony from near Kemmerer, Wyoming. It has grown on the walls of a cavity in fossil wood. The wood itself (see next picture in the photostream) is quartz-permineralized ("petrified wood") and was deposited in ancient Lake Gosiute, a large inland body of water that covered much of southern and southwestern Wyoming, plus parts of far-northwestern Colorado during the Eocene. Blue chalcedony-bearing fossil wood from this area is nicknamed "Blue Forest Wood". Stratigraphy: Green River Formation or Bridger Formation, Eocene Locality: unrecorded/undisclosed site near Fontenelle Reservoir, northeast of the town of Kemmerer, southwestern Wyoming, USA See info. at: Mustoe et al. (2019) - Mineralogy of Eocene fossil wood from the "Blue Forest" locality, southwestern Wyoming, United States. Geosciences 9(1)(35). 26 pp. [click the blue box "Download full-text PDF" at: <a href="https://www.researchgate.net/publication/330292211_Mineralogy_of_Eocene_Fossil_Wood_from_the_Blue_Forest_Locality_Southwestern_Wyoming_United_States" rel="noreferrer nofollow">www.researchgate.net/publication/330292211_Mineralogy_of_...</a>] |
| Date | |
| Source | Blue chalcedony (Fontenelle Reservoir, northeast of Kemmerer, Wyoming, USA) |
| 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@N05/32437936397 (archive). It was reviewed on 7 November 2019 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 | 03:30, 7 November 2019 | | 2,137 × 1,324 (2.89 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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