File:Gold after sylvanite lining fracture in phonolite, Cripple Creek Diatreme.jpg
Size of this preview: 800 × 547 pixels. Other resolutions: 320 × 219 pixels | 640 × 437 pixels | 1,024 × 700 pixels | 1,280 × 875 pixels | 2,396 × 1,637 pixels.
Original file (2,396 × 1,637 pixels, file size: 3.65 MB, MIME type: image/jpeg)
 | This is a file from the Wikimedia Commons. Information from its description page there is shown below. Commons is a freely licensed media file repository. You can help. |
Summary
| Description |
Gold after calaverite lining fracture in phonolite from the Cripple Creek Diatreme, Early Oligocene, 32 Ma, central Colorado, USA. The gold has taken on the crystal form of the original calaverite mineral (specimen owned by the Colorado School of Mines Geology Museum, Golden, Colorado, USA). The Cripple Creek Gold District of central Colorado, USA is famous for its unusual gold and silver mineralization. Precious metal mineralization occurs in the Cripple Creek Diatreme, the root zone of a deeply eroded volcano dating to the Early Oligocene (32 Ma). The dominant lithology at Cripple Creek is the scarce igneous rock phonolite, an alkaline, intermediate, extrusive igneous rock. Cripple Creek gold can be found in its native state (Au), but it typically occurs in the form of gold telluride minerals (for example, sylvanite - (Au,Ag)2Te4, calaverite - AuTe2, petzite - Ag3AuTe2, krennerite - (Au,Ag)Te2, and nagyagite - Pb5Au(Sb,Bi)Te2S6). Silver also occurs in some Cripple Creek minerals, including sylvanite, petzite, krennerite, hessite - Ag2Te, tennantite - (Cu,Ag,Fe,Zn)12As4S13, acanthite - Ag2S, and tetrahedrite - (Cu,Fe,Ag,Zn)12Sb4S13. |
| Date | |
| Source | Gold after sylvanite lining fracture in phonolite, Cripple Creek Diatreme (Early Oligocene, 32 Ma), central Colorado |
| Author | James St. John |
Licensing
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 jsj1771 at https://www.flickr.com/photos/47445767@N05/14550146279. It was reviewed on 1 August 2014 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0. |
File history
Click on a date/time to view the file as it appeared at that time.
| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 22:44, 31 July 2014 | | 2,396 × 1,637 (3.65 MB) | Tillman | Transferred from Flickr via Flickr2commons |
File usage
The following page uses this file:
