U.S. Geological Survey Geochemical Reference Materials and Certificates
The USGS Geochemical Reference Materials project provides geochemical reference materials for use by scientists in all areas of earth science. The majority of USGS reference materials are based on silicate rocks that were collected from the continential United States and Hawaii and range in composition from basalt to shale. The composition of these reference materials has been determined through rigorous testing procedures by multiple laboratories using a wide variety of analytical techniques. The reference materials are suitable for use in calibration of analytical instrumentation, testing analytical methodologies, and for use as quality control samples. For more information on this program please see our Fact Sheet.
The html versions of the certificates are recommended for viewing and the PDF versions are recommended for printing.
The use of firm, trade, and brand names is for identification purposes only and does not constitute endorsement by the U.S. government.
158,700 visitors as of April 2014.