There are 2 datasets tagged with geochemistry:
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About "This is the main distribution web site for spatial data generated for, and collected by, the Mineral Resources Program (MRP) of the U.S. Geological Survey. This site is operated by...
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A free database of chemicals, covering around 26 million compounds integrated from 400 data sources. The database APIs are free for academic users, or for non-academic non-commercial...