File:Gold after sylvanite lining fracture in phonolite, Cripple Creek Diatreme.jpg
![File:Gold after sylvanite lining fracture in phonolite, Cripple Creek Diatreme.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/a/ab/Gold_after_sylvanite_lining_fracture_in_phonolite%2C_Cripple_Creek_Diatreme.jpg/800px-Gold_after_sylvanite_lining_fracture_in_phonolite%2C_Cripple_Creek_Diatreme.jpg?20140731224438)
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Summary
[edit]DescriptionGold after sylvanite lining fracture in phonolite, Cripple Creek Diatreme.jpg |
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. |
1 August 2014
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current | 22:44, 31 July 2014 | ![]() | 2,396 × 1,637 (3.65 MB) | Tillman (talk | contribs) | Transferred from Flickr via Flickr2commons |
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Exposure time | 1/125 sec (0.008) |
F-number | f/7.1 |
Date and time of data generation | 11:48, 25 July 2007 |
Lens focal length | 200 mm |
Orientation | Normal |
Horizontal resolution | 300 dpi |
Vertical resolution | 300 dpi |
Software used | Adobe Photoshop CS2 Macintosh |
File change date and time | 17:48, 24 July 2014 |
Y and C positioning | Co-sited |
Exposure Program | Not defined |
Exif version | 2.21 |
Date and time of digitizing | 11:48, 25 July 2007 |
Meaning of each component |
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Image compression mode | 4 |
APEX exposure bias | 0 |
Maximum land aperture | 5 APEX (f/5.66) |
Metering mode | Pattern |
Light source | Unknown |
Flash | Flash fired, strobe return light detected, auto mode |
DateTime subseconds | 90 |
DateTimeOriginal subseconds | 90 |
DateTimeDigitized subseconds | 90 |
Supported Flashpix version | 1 |
Color space | sRGB |
Sensing method | One-chip color area sensor |
File source | Digital still camera |
Scene type | A directly photographed image |
Custom image processing | Normal process |
Exposure mode | Auto exposure |
White balance | Auto white balance |
Digital zoom ratio | 1 |
Focal length in 35 mm film | 300 mm |
Scene capture type | Standard |
Scene control | None |
Contrast | Normal |
Saturation | Normal |
Sharpness | Normal |
Subject distance range | Unknown |
Supported Flashpix version | 1 |
Image width | 2,396 px |
Image height | 1,637 px |
Date metadata was last modified | 13:48, 24 July 2014 |