The production and certification of these materials to the highest metrological standards is carried out by the IAG Certification Committee according to the IAG Certification Procotol [1, 2], which takes account of ISO Guides 34 and 35.
Because of the variety of composition of geological materials, the Certification Committee of the IAG places great emphasis on the qualifications of the laboratories supplying data for each certification exercise. They are selected on the basis of their performance in the IAG’s GeoPT proficiency testing programme. Only experienced laboratories that achieve outstanding results for a GeoPT material of the same or similar matrix are invited to contribute data for the assignment of the final certified values and calculation of measurement uncertainty.
| Purchase Code | Name | Material | Certificate | *Price |
| IAG CRM-1 | OU-6 | Penrhyn Slate | OU-6 CoA | 150 GBP |
| IAG CRM-2 | MGL-GAS | Serpentinite | GAS CoA | 150 GBP |
| IAG CRM-3 | MGL-OShBO | Alkaline Granite | OShBO CoA | 150 GBP |
| IAG CRM-4 | OKUM | Komatiite Ontario | OKUM CoA | 150 GBP |
| IAG CRM-5 | MUH-1 | Harzburgite Kraubath | MUH-1 CoA | 150 GBP |
| IAG CRM-6 | MGL-MRH-1 | Rhyolite | MRH-1 CoA | 150 GBP |
| IAG CRM-7 | MGL-MTA-1 | Trachyandesite | MTA-1 CoA | 150 GBP |
| IAG CRM-8 | MGL-ML-3 | Limestone | ML-3 CoA | 150 GBP |
| *discount available to IAG members | ||||
References:
1. J.S. Kane, P.J. Potts, M. Wiedenbeck, J. Carignan and S. Wilson (2003). International Association of Geoanalysts’ protocol for the certification of geological and environmental reference materials. Geostandards Newsletter: The Journal of Geostandards and Geoanalysis, 27, 227-2442. J.S. Kane, P.J. Potts, T. Meisel and M. Wiedenbeck (2007). International Association of Geoanalysts’ protocol for the certification of geological and environmental reference materials: a supplement. Geostandards and Geoanalytical Research, 31, 285-288