The geochemical analysis of minerals and geologi-cal glasses relies on well characterised reference materials. In an ideal world, homogeneous reference materials should match the chemical compositions of the unknown phase as closely as possible. However, most geochemical laborator ies use National Institute of Standards and Technology certi-fied reference materials (NIST SRM 610 or NIST SRM 612) for the determination of trace elements in mine-rals and glasses. This could pose a problem as th
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