Talk:Psilomelane

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	Earth sciences portal Psilomelane is part of WikiProject Rocks and minerals, an attempt at creating a standardized, informative, comprehensive and easy-to-use rocks and minerals resource. If you would like to participate, you can choose to edit this article, or visit the project page for more information.Rocks and mineralsWikipedia:WikiProject Rocks and mineralsTemplate:WikiProject Rocks and mineralsRocks and minerals articles
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This article reports that psilomelane is "is extensively mined in Vermont, Virginia, Arkansas". According to the United States Geological Survey's mineral commodity summaries, no manganese ore containing more than 20% manganese has been produced in the United States since 1970. http://minerals.usgs.gov/minerals/pubs/commodity/manganese/mcs-2015-manga.pdf — Preceding unsigned comment added by 71.182.238.243 (talk) 18:44, 18 April 2015 (UTC)[reply]