File:Gold after sylvanite lining fracture in phonolite, Cripple Creek Diatreme.jpg
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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 |
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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. |
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| 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 |
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