File:Holley Blue Agate, Sweet Home, OR (3.9 cm).jpg

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Agate from Oregon, USA. (top specimen is 3.9 cm across)

"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.

These two samples are "Holley Blue Agate" from Oregon. They are composed of pale purplish chalcedony. This material is famous, but is never accompanied by useful information, in terms of specific locality or geologic context. I don't know what the host rock is, or the stratigraphy, or the age. I suspect that this chalcedony fills vesicles in Cenozoic-aged lava. The locality does not appear to be specified anywhere in the literature. The best locality information I have is “Holley Mountain” (wherever that is) near the towns of Holley or Sweet Home or Lebanon.

Locality: Linn County, western Oregon, USA
Date
Source Holley Blue Agate, Sweet Home, OR (3.9 cm)
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@N05/31731648743. It was reviewed on 27 January 2017 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0.

27 January 2017

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current00:43, 27 January 2017Thumbnail for version as of 00:43, 27 January 20171,349 × 769 (1.13 MB)Kingofthedead (talk | contribs)Transferred from Flickr via Flickr2Commons

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