Certified Reference Material
Purchase Code: IAG CRM-10
Price
IAG members: £ 100
Non-Members: £ 150
Certificate
BNA-1 certificate
Description
Sample description
IAG BNA-1 is a tholeiitic basalt collected from the same quarry believed to be the source of the reference material USGS BIR-1 (Reykjavik, Iceland Basalt).
Sample preparation
About 200 kg of rock material was shipped to the British Geological Survey for grinding, homogenising and bottling of the material. The material was milled (using hardened steel milling equipment) so that 94% pass a 53 µm sieve.
Mineralogical composition
| Mineral |
% |
| Anorthite | 46.0 |
| Augite | 34.1 |
| Forsterite | 19.9 |
| Magnesite | <0.5 |
| Cristobalite | <0.5 |
Derivation of certified values
BNA-1 is certified for 8 major oxides and 29 trace element mass fractions according to the IAG’s certification protocol based on assigned values derived from results submitted to round 54 of the IAG’s GeoPT proficiency testing programme. Information values are also provided for 1 major oxide and 13 trace element mass fractions. A full description of the application of the IAG’s protocol to the certification of IAG BNA-1 has been submitted for publication in Geostandards and Geoanalytical Research.