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File:Chalcopyrite-quartz - Idarado Mine, San Juan Mountains, Colorado, USA (22487007594).jpg

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Chalcopyrite-quartz from the Tertiary of Colorado, USA. (public display, Durango & Silverton Narrow Gauge Railroad Museum, Durango, Colorado, USA)

This is a sample of a polymineralic hydrothermal vein that has intruded volcanic rocks of southwestern Colorado's San Juan Volcanic Field. The abundant brassy gold masses are chalcopyrite (CuFeS - copper iron sulfide). The whitish material is quartz (SiO2 - silica). The grayish material is probably one or more sulfides - galena or tetrahedrite or petzite. This rock comes from the Idarado Mine, a lead-copper-zinc mine in the San Juan Mountains.

Geology & age: Argentine Vein, San Juan Volcanic Field, mid-Tertiary

Locality: Idarado Mine, ~2.7 air miles southwest of the town of Ironton, southern Ouray County, San Juan Mountains, southwestern Colorado, USA
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Source Chalcopyrite-quartz (Idarado Mine, San Juan Mountains, Colorado, USA) 2
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@N05/22487007594. It was reviewed on 3 December 2015 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0.

3 December 2015

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current20:02, 3 December 2015Thumbnail for version as of 20:02, 3 December 20154,000 × 2,951 (4.41 MB)Basilicofresco (talk | contribs)Transferred from Flickr via Flickr2Commons

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