TL4382 : Jarosite, KFe3+3(OH)6(SO4)2

taken 12 years ago, near to Mepal, Cambridgeshire, Great Britain

Jarosite,  KFe3+3(OH)6(SO4)2
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.
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TL4382, 6 images   (more nearby )
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Date Taken
Saturday, 9 June, 2007   (more nearby)
Saturday, 9 June, 2007
Soil   (more nearby)
Subject Location
OSGB36: geotagged! TL 4337 8265 [10m precision]
WGS84: 52:25.3830N 0:6.4181E
Camera Location
OSGB36: geotagged! TL 4337 8265
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