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

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There are 4 names in this directory beginning with the letter M.
Matrix Reference Materials
Measurement Error
Error attributed to the method of measurement of a particular parameter at a particular laboratory.
Metrological Traceability
Property of a measurement result whereby the result can be related to a reference through a documented unbroken chain of calibrations, each contributing to the measurement uncertainty.
Mineral Reference Materials
Reference Materials made from soils, rocks or ores for use to check assays of soil, rock and ore samples with similar grades or chemical characteristics. As opposed to, for example, other types of Reference Materials such as for those made to check tests for thermal conductivity, electrical resistivity, peanut butter, whale blubber, cigarette ignition etc.