File:Interlayered hydrogrossular garnetite and chromitite (Transvaal jade) (Critical Zone, Bushveld Complex, Paleoproterozoic, ~2.05 Ga; Bonjanala Platinum District, South Africa) 1.jpg
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[edit]DescriptionInterlayered hydrogrossular garnetite and chromitite (Transvaal jade) (Critical Zone, Bushveld Complex, Paleoproterozoic, ~2.05 Ga; Bonjanala Platinum District, South Africa) 1.jpg |
English: Interlayered hydrogrossular garnetite and chromitite ("Transvaal jade") from the Precambrian of South Africa. (8.5 cm across at its widest)
This attractive rock is nicknamed "Transvaal jade", but it is not jade. "True" jade refers to either nephrite or jadeitite metamorphic rocks. Transvaal jade is a greenish garnetite, a crystalline-textured metamorphic rock composed of hydrogrossular garnet. The black bands are layers of chromitite, which is a granular, crystalline-textured, intrusive igneous rock composed of the mineral chromite (FeCr2O4 - iron chromium oxide). This rock has been metamorphosed. The precursor, or protolith - the original rock before metamorphic alteration - was anorthosite having bands of chromitite. Anorthosite is a scarce, coarsely-crystalline, intrusive igneous rock composed exclusively, or almost exclusively, of plagioclase feldspar (NaAlSi3O8 to CaAl2Si2O8 - sodium aluminosilicate to calcium aluminosilicate). The plagioclase feldspar has been metamorphosed to grossular garnet, while the chromitite bands have retained their original mineralogy. Stratigraphy: Critical Zone, Western Lobe of the Rustenburg Layered Suite, Bushveld Complex, Paleoproterozoic, ~2.05 Ga Locality: old diggings on the grounds of a Lonmin platinum mine, apparently at or near Buffelsfontein, Bonjanala Platinum District Municipality, North West Province, South Africa |
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Source | https://www.flickr.com/photos/47445767@N05/18998184410/ |
Author | jsj1771 |
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Camera manufacturer | Canon |
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Camera model | Canon PowerShot D10 |
Exposure time | 1/60 sec (0.016666666666667) |
F-number | f/11 |
ISO speed rating | 80 |
Date and time of data generation | 14:55, 26 June 2015 |
Lens focal length | 11.614 mm |
Width | 4,000 px |
Height | 3,000 px |
Bits per component |
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Pixel composition | RGB |
Orientation | Normal |
Number of components | 3 |
Horizontal resolution | 180 dpi |
Vertical resolution | 180 dpi |
Software used | Adobe Photoshop Elements 13.0 (Macintosh) |
File change date and time | 17:03, 26 June 2015 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 14:55, 26 June 2015 |
Meaning of each component |
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Image compression mode | 3 |
APEX shutter speed | 5.90625 |
APEX aperture | 6.90625 |
APEX exposure bias | −0.66666666666667 |
Maximum land aperture | 4 APEX (f/4) |
Metering mode | Pattern |
Flash | Flash fired, compulsory flash firing, red-eye reduction mode |
Supported Flashpix version | 1 |
Color space | sRGB |
Focal plane X resolution | 16,460.905349794 |
Focal plane Y resolution | 16,483.516483516 |
Focal plane resolution unit | inches |
Sensing method | One-chip color area sensor |
File source | Digital still camera |
Custom image processing | Normal process |
Exposure mode | Manual exposure |
White balance | Auto white balance |
Digital zoom ratio | 1 |
Scene capture type | Portrait |
Lens used | 6.2-18.6 mm |
Date metadata was last modified | 13:03, 26 June 2015 |
Unique ID of original document | BE640C3C6BEE15F8AFFCFE2CFCC67661 |