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File:Teepee Canyon Agate (Black Hills, South Dakota, USA) 1 (27007533947).jpg

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Agate from the Black Hills of 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: unrecorded/undisclosed site in the Black Hills, western South Dakota, USA
Date
Source Teepee Canyon Agate (Black Hills, South Dakota, USA) 1
Author James St. John

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This file is licensed under the Creative Commons Attribution 2.0 Generic license.
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/27007533947 (archive). It was reviewed on 10 October 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

10 October 2019

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Date/TimeThumbnailDimensionsUserComment
current07:15, 10 October 2019Thumbnail for version as of 07:15, 10 October 20192,773 × 2,350 (4.7 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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