File:Chalcopyrite-pyrrhotite (Late Cretaceous; Cable Mine, 1.4 miles east of Georgetown, Deer Lodge County, western Montana, USA) 5.jpg

From Wikimedia Commons, the free media repository
Jump to navigation Jump to search

Original file (1,660 × 1,584 pixels, file size: 1.07 MB, MIME type: image/jpeg)

Captions

Captions

Add a one-line explanation of what this file represents

Summary

[edit]
Description
English: Chalcopyrite-pyrrhotite mass from the Cretaceous of Montana, USA (freshly broken surface; field of view ~2.4 cm across).

This is a sulfide mass from a replacement deposit (gold-copper contact metamorphic deposit) at Montana's Cable Mine. The rock principally consists of chalcopyrite (CuFeS2 - copper iron sulfide) and pyrrhotite (Fe1-xS - imperfect iron monosulfide). The latter mineral is basically magnetic fool's gold. The brassy portions of the specimen (see above photo) are chalcopyrite. The more silvery-colored areas are pyrrhotite.

The Cable Mine is a gold mine started in the 1860s. It targeted macroscopic and microscopic native gold mixed with quartz, calcite, sulfides, and other minerals. The ore body at this mine is in a large, ~tabular mass of calcitic marble, which is metamorphosed dolomitic limestone of the Upper Cambrian Hasmark Formation. The limestone was contact metamorphosed into ore-bearing marble by the intrusion of the Cable Batholith, a Late Cretaceous granodiorite unit. The marble mass is almost completely surrounded by granodiorite, and is likely a roof pendant of that intrusion. Ore formation involved metasomatism - the introduction of elements from hydrothermal fluids emanating from the granodiorite magma.

Locality: Cable Mine (a.k.a. Atlantic Cable Mine), near the head of Cable Creek, southern slopes of Cable Mountain, ~1.4 miles east of Georgetown, Georgetown Mining District (Southern Cross Mining District; Cable Mining District), northwestern Deer Lodge County, western Montana, USA
Date
Source https://www.flickr.com/photos/47445767@N05/15752522248/
Author James St. John

Licensing

[edit]
w:en:Creative Commons
attribution
This file is licensed under the Creative Commons Attribution 2.0 Generic license.
You are free:
  • to share – to copy, distribute and transmit the work
  • to remix – to adapt the work
Under the following conditions:
  • attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/15752522248 (archive). It was reviewed on 22 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

22 December 2019

File history

Click on a date/time to view the file as it appeared at that time.

Date/TimeThumbnailDimensionsUserComment
current18:18, 22 December 2019Thumbnail for version as of 18:18, 22 December 20191,660 × 1,584 (1.07 MB)Ser Amantio di Nicolao (talk | contribs)User created page with UploadWizard

You cannot overwrite this file.

The following page uses this file:

Metadata

This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.

Retrieved from "https://commons.wikimedia.org/w/index.php?title=File:Chalcopyrite-pyrrhotite_(Late_Cretaceous;_Cable_Mine,_1.4_miles_east_of_Georgetown,_Deer_Lodge_County,_western_Montana,_USA)_5.jpg&oldid=888078173"