File:Jarosite, KFe3-3(OH)6(SO4)2 - geograph.org.uk - 460813.jpg
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DescriptionJarosite, KFe3-3(OH)6(SO4)2 - geograph.org.uk - 460813.jpg |
English: Jarosite, KFe3+3(OH)6(SO4)2 Jarosite is a straw-yellow basic sulphate that forms on the oxidation of iron sulphides (FeS2) in soils and sediments. This soil sample was removed from the subsoil of a trial pit at the Arthur Rickwood Experimental Husbandry Farm, Mepal Fen, Cambs. Oxidation has been brought about by drainage of the land for agriculture and associated features are strong acidity (pH less than 4) caused by the release of sulphuric acid, orange-coloured deposits of ochre in drainage pipes and drains, and aluminium toxicity causing a stunted, deformed root system. Soils with strong acidity formed by this process are known as 'acid sulphate soils'; they are common in the perimarine zone of the Fenland of Eastern England where the original sulphides were supplied by a series of marine transgressions. Jarosite is a prominent feature of mineral sediments such as the Fen Clay but is absent from fen peat which also experiences strong acidification in these areas. |
Date | |
Source | From geograph.org.uk |
Author | Rodney Burton |
Attribution (required by the license) InfoField | Rodney Burton / Jarosite, KFe3+3(OH)6(SO4)2 / |
InfoField | Rodney Burton / Jarosite, KFe3+3(OH)6(SO4)2 |
Camera location | 52° 25′ 23.1″ N, 0° 06′ 25″ E | View this and other nearby images on: OpenStreetMap | 52.423090; 0.107000 |
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Object location | 52° 25′ 23.1″ N, 0° 06′ 25″ E | View this and other nearby images on: OpenStreetMap | 52.423090; 0.107000 |
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Licensing[edit]
This image was taken from the Geograph project collection. See this photograph's page on the Geograph website for the photographer's contact details. The copyright on this image is owned by Rodney Burton and is licensed for reuse under the Creative Commons Attribution-ShareAlike 2.0 license.
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This file is licensed under the Creative Commons Attribution-Share Alike 2.0 Generic license.
Attribution: Rodney Burton
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 18:58, 4 February 2011 | 480 × 640 (429 KB) | GeographBot (talk | contribs) | == {{int:filedesc}} == {{Information |description={{en|1=Jarosite, KFe3+3(OH)6(SO4)2 Jarosite is a straw-yellow basic sulphate that forms on the oxidation of iron sulphides (FeS2) in soils and sediments. This soil sample was removed from the subsoil of |
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Camera manufacturer | Canon |
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Camera model | Canon EOS 400D DIGITAL |
Exposure time | 1/320 sec (0.003125) |
F-number | f/14 |
ISO speed rating | 400 |
Date and time of data generation | 17:57, 9 June 2007 |
Lens focal length | 30 mm |
Orientation | Normal |
Horizontal resolution | 72 dpi |
Vertical resolution | 72 dpi |
Software used | Adobe Photoshop 7.0 |
File change date and time | 18:19, 9 June 2007 |
Y and C positioning | Co-sited |
Exposure Program | Normal program |
Exif version | 2.21 |
Date and time of digitizing | 17:57, 9 June 2007 |
APEX shutter speed | 8.3219299316406 |
APEX aperture | 7.6147155761719 |
APEX exposure bias | 0 |
Metering mode | Pattern |
Flash | Flash did not fire, compulsory flash suppression |
Color space | sRGB |
Focal plane X resolution | 4,433.2953249715 |
Focal plane Y resolution | 4,453.6082474227 |
Focal plane resolution unit | inches |
Custom image processing | Normal process |
Exposure mode | Auto exposure |
White balance | Auto white balance |
Scene capture type | Standard |