File:Agate-filled geode (Brazil) 1 (31912507804).jpg

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Agate from Brazil. (public display, Carnegie Museum of Natural History, Pittsburgh, Pennsylvania, USA)

"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).

The whitish-gray, glassy material at the center of this specimen is macrocrystalline quartz.
Date
Source Agate-filled geode (Brazil) 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@N05/31912507804 (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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current07:12, 10 October 2019Thumbnail for version as of 07:12, 10 October 20192,047 × 1,912 (1.79 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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