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File:Gossan (Betty Baker Mine, Carroll County, Virginia, USA) 2.jpg

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English: (public display, Geology Department, Wittenberg University, Springfield, Ohio, USA)

Gossan is a porous, iron hydroxy-oxide rock formed by oxidative weathering of various sulfide deposits - in this case, a massive sulfide deposit. The gossan itself is composed of hematite (reddish), goethite (brownish), and limonite (yellowish-brown).

This sample is from a mining district in the Blue Ridge of Virginia. It was once mined as a source of iron ore. The original massive sulfide deposit was likely very similar to still-existing examples in this section of the Blue Ridge. The sulfide minerals include pyrrhotite, pyrite, sphalerite, and galena. Non-sulfide minerals include quartz, feldspar, amphibole, chlorite, biotite mica, dolomite, and garnet.

Locality: Betty Baker Mine, northeastern Gossan Lead Mining District, north of the town of Hillsville, northern Carroll County, southwestern Virginia, USA (apparently located at 36° 50' 44.20" North latitude, 80° 43' 25.50" West longitude)

Area-specific geology synthesized from:

Wright et al. (1948) - The Gossan Lead, Carroll County, Virginia. United States Geological Survey Open File Report 48-3. 19 pp. 6 figs. (pubs.usgs.gov/of/1948/0003/report.pdf )

See info. at:

en.wikipedia.org/wiki/Gossan
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Source https://www.flickr.com/photos/47445767@N05/41138428141/
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@N05/41138428141. It was reviewed on 7 November 2022 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

7 November 2022

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