File:Agate (Borden Formation, Lower Mississippian; eastern Kentucky, USA) 12 (32756317525).jpg
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Original file (3,680 × 2,780 pixels, file size: 2.55 MB, MIME type: image/jpeg)
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Summary
| Description |
Agate nodule from Kentucky, USA. This is the interior of an agate nodule. "Agate" is a rockhound/collector term for irregularly- & concentrically-layered masses of microcrystalline quartz. Individual layers consist of translucent or opaque, microcrystalline, fibrous quartz called chalcedony. Impurities in different layers cause variations in color. Many agate masses are simply geodes that have completely filled up with quartz. Common agate colors are clearish-whitish-grayish, brownish-red, and yellowish-brown. Commercial agates that occur in greens and blues and purples are almost always dyed (faked). Geologic context: nodule hosted in the Borden Formation, Lower Mississippian Locality: unrecorded/undisclosed site in Powell County or Estill County or Jackson County or Madison County, eastern Kentucky, USA |
| Date | |
| Source | Agate (Borden Formation, Lower Mississippian; eastern Kentucky, USA) 12 |
| Author | James St. John |
Licensing
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/32756317525 (archive). It was reviewed on 8 October 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 03:58, 8 October 2019 | | 3,680 × 2,780 (2.55 MB) | Ser Amantio di Nicolao | Transferred from Flickr via #flickr2commons |
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