File:Rockhounds banner Teepee Canyon Agate.jpg
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Summary[edit]
| Description |
Agate ("Teepee Canyon Agate") from the Black Hills of South Dakota, USA. (public display, National Rockhound Hall of Fame, Murdo, South Dakota, USA) "Agate" is a rockhound/collector term for cavities in rocks (usually sedimentary rocks such as limestone or igneous rocks such as basalt) that have been partially or completely filled with irregularly concentric layers of microcrystalline, fibrous quartz (chalcedony - SiO2). Agate is quartz. Teepee Canyon Agate is derived from limestones of the Minnelusa Formation (Upper Pennsylvanian to Lower Permian), which outcrops in the Black Hills. Locality: Teepee Canyon, Black Hills, Custer County, western South Dakota, USA |
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| Date | ||||
| Source | Teepee Canyon Agate (Teepee Canyon, South Dakota, USA) 1 | |||
| Author | James St. John | |||
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_1_(32715412836).jpg)
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
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| current | 19:53, 16 April 2024 | | 2,052 × 293 (379 KB) | AlasdairW (talk | contribs) | File:Teepee Canyon Agate (Teepee Canyon, South Dakota, USA) 1 (32715412836).jpg cropped 23 % horizontally, 85 % vertically using CropTool with precise mode. |
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