Meissen Granite IAG GMN-1 certified using the GeoPT Proficiency Testing Certification Protocol

A sample of the leucomonzogranite from the central area of the Meißner Massif (Germany, Saxony), also known as 'Riesensteingranit', was the subject of round 51 of the GeoPT proficiency testing programme that included participation by 112 geoanalytical laboratories from 43 countries.

In the 1960s, the ‘Riesensteingranit’ was previously sampled and certified as the reference material GM by the Zentrales Geologisches Institut Berlin (German Democratic Republic) in the 1960s, in accordance with the Council for Mutual Economic Assistance Standard 2299 (1) .

To enable full certification of materials from the GeoPT proficiency testing programme in accordance with the latest version of ISO Guide 35:2017, a rigorous certification protocol has been developed and published (2).

This protocol has now been applied for the first time in GeoPT Round 51. Certified values for the new certified reference material IAG GMN-1, Meissen granite is certified for nine major elements and thirty-nine trace elements, values of which are reported together with a thorough description of the sample (3). These results are presented and compared with the data from GM.

1 Kaemmel, T., Schrön, W., & Störr, M. (2011) in Zur Geschichte der Geowissenschaften in der DDR - Teil 2, Vol. 18, M. Guntau, W. Pälchen, M. Störr, & O. Hartmann (Eds), Verlag Störr, Ostklüne, pp 167 - 174

2 Potts, P.J., Webb, P.C., & Thompson, M. (2019) Geostandards and Geoanalytical Research 43, 409-418 doi:https://doi.org/10.1111/ggr.12261

3 Potts, P.J., Webb, P.C., Gowing, C.J.B., & Renno, A.D. (2024) Geostandards and Geoanalytical Research, doi:https://doi.org/10.1111/ggr.12553