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File:Pyrolusite (Nuevo León State, Mexico).jpg

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English: Pyrolusite is a manganese oxide mineral, MnO2. It is the most common of the dozens of known manganese oxide minerals. They usually have a silvery-black luster. Like uranium, manganese is soluble in acids and insoluble in bases. Surface water and streams (pH = ~5 to 7) tend to dissolve manganese, but in ocean water (pH = ~7.5 to 8.4), it precipitates out. Analysis is often needed to accurately identify what species of Mn-oxide is present. This specimen is labeled as pyrolusite, but I can't confirm that. Locality: unrecorded/undisclosed site in Nuevo León State, northeastern Mexico
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Source https://www.flickr.com/photos/47445767@N05/50725668382/
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@N05/50725668382. It was reviewed on 16 December 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

16 December 2020

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current17:13, 16 December 2020Thumbnail for version as of 17:13, 16 December 20202,168 × 1,890 (2.74 MB)Ser Amantio di Nicolao (talk | contribs)Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/50725668382/ with UploadWizard

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