The following terms are used here and in literature elsewhere to discuss reference materials.

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There are currently 2 names in this directory beginning with the letter O.
The range of CRMs produced by Ore Research & Exploration Pty Ltd (OREAS is an acronym for Ore Research & Exploration Assay Standards).
The proprietary name for OREAS CRMs which have been certified for complete ICP-OES and ICP-MS element suites for multiple digestion methods within a single CRM. This can result in a single CRM being certified for up to 179 individual analyte-method pairs. OREAS SuperCRMs® are useful for a diverse range of applications including pathfinder and litho-geochemical programs.