File:Holley Blue Agate (Linn County, Oregon, USA) 9.jpg

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Summary

DescriptionHolley Blue Agate (Linn County, Oregon, USA) 9.jpg
English: Agate from Oregon, 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.

Seen here is "Holley Blue Agate" (a.k.a. "Calapooia Purple Agate") from Oregon - it's composed of lavender- to purplish-colored chalcedony. This material is hosted in weathered/decomposed tholeiitic basalts of the Little Butte Volcanic Series (Oligocene).

Locality: unrecorded/undisclosed site in Linn County, western Oregon, USA
Date
Source https://www.flickr.com/photos/47445767@N05/50742190807/
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@N05/50742190807. It was reviewed on 21 December 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

21 December 2020

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current20:15, 21 December 2020Thumbnail for version as of 20:15, 21 December 20201,964 × 1,274 (1.7 MB)smartcommons>Ser Amantio di NicolaoUploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/50742190807/ with UploadWizard

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