Certified Reference Material
Purchase Code: IAG CRM-9
Price
IAG members: £ 100
Non-Members: £ 150
Certificate
MGN-1 certificate
Description
Sample description
IAG MGN-1 is a leucomonzogranite from the Meissen Massif (Germany) and represents the youngest and probably smallest intrusive stage of this late Variscan Massif.
Sample preparation
About 150 kg from an operational quarry was initially processed at GFZ Potsdam before shipping to the British Geological Survey for grinding, homogenising and bottling of the material. The material was milled (using hardened steel milling equipment) so that 93% pass a 53 µm sieve.
Mineralogical composition
Modal analysis gives the following mineral composition:
| Mineral |
area% |
| Quartz | 33.6 |
| K-feldspar | 26.4 |
| Plagioclase | 36.3 |
| Mica | 2.2 |
| Chlorite | 0.8 |
| Other | 0.5 |
Derivation of certified values
GMN-1 is certified for 9 major oxides and 39 trace element mass fractions according to the IAG’s certification protocol based on assigned values derived from results submitted to round 51 of the IAG’s GeoPT proficiency testing programme. Information values are also provided for 1 major oxide and 8 trace element mass fractions. A full description of the application of the IAG’s protocol to the certification of IAG GMN-1 is available in Potts et al. 2024, Geostandards and Geoanalytical Research, doi.org/10.1111/ggr.12553.