File:Kimberlite (Cretaceous; Kimberley, South Africa) (14822955322).jpg
![File:Kimberlite (Cretaceous; Kimberley, South Africa) (14822955322).jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/9/98/Kimberlite_%28Cretaceous%3B_Kimberley%2C_South_Africa%29_%2814822955322%29.jpg/622px-Kimberlite_%28Cretaceous%3B_Kimberley%2C_South_Africa%29_%2814822955322%29.jpg?20191201090527)
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Summary
[edit]DescriptionKimberlite (Cretaceous; Kimberley, South Africa) (14822955322).jpg |
Kimberlite from a Cretaceous-aged diamondiferous pipe at Kimberley, South Africa (CMNH 18991R, Cleveland Museum of Natural History, Cleveland, Ohio, USA). Kimberlites and lamproites have tremendous economic importance because they are host rocks for gem-grade and industrial-grade diamonds. Kimberlites & lamproites are unusual igneous bodies having overall pipe-shaped geometries. Their mode of formation is only moderately understood because they have not been observed forming. Kimberlites & lamproites are known from scattered localities throughout the world - only some are significantly diamondiferous. Classic localities for diamonds are India and Brazil. Africa was also discovered to have many kimberlites and is world-famous for producing large numbers of diamonds. Other notable diamondiferous kimberlite-lamproite occurrences include Russia, China, northwestern Australia, and northwestern Canada. Kimberlites are named for the town of Kimberley, South Africa. Several kimberlite pipes occur in the Kimberley area. Kimberlites have a gently tapering-downward, pipe-shaped cross-section. Lamproites have a cross-section more closely resembling that of a martini glass. |
Date | |
Source | Kimberlite (Cretaceous; Kimberley, South Africa) |
Author | James St. John |
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/14822955322 (archive). It was reviewed on 1 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
1 December 2019
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 09:05, 1 December 2019 | ![]() | 1,825 × 1,758 (1.58 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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Camera manufacturer | NIKON CORPORATION |
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Camera model | NIKON D70s |
Exposure time | 1/60 sec (0.016666666666667) |
F-number | f/4.5 |
Date and time of data generation | 13:51, 22 July 2006 |
Lens focal length | 44 mm |
Orientation | Normal |
Horizontal resolution | 300 dpi |
Vertical resolution | 300 dpi |
Software used | Adobe Photoshop CS2 Macintosh |
File change date and time | 16:24, 17 February 2007 |
Y and C positioning | Co-sited |
Exposure Program | Not defined |
Exif version | 2.21 |
Date and time of digitizing | 13:51, 22 July 2006 |
Meaning of each component |
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Image compression mode | 4 |
APEX exposure bias | 0 |
Maximum land aperture | 4.2 APEX (f/4.29) |
Metering mode | Pattern |
Light source | Unknown |
Flash | Flash fired, strobe return light detected, auto mode |
DateTime subseconds | 00 |
DateTimeOriginal subseconds | 00 |
DateTimeDigitized subseconds | 00 |
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 | 66 mm |
Scene capture type | Standard |
Scene control | None |
Contrast | Normal |
Saturation | Normal |
Sharpness | Normal |
Subject distance range | Unknown |
Supported Flashpix version | 1 |
Image width | 1,825 px |
Image height | 1,758 px |
Date metadata was last modified | 11:24, 17 February 2007 |