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New Compositional and Structural Constraints on the Smithsonian Microanalytical Reference Materials: Amphiboles from Kakanui and Arenal

The amphiboles from Kakanui and Arenal are two natural minerals that have been used worldwide as microanalytical reference materials, but their compositions and crystal structures are still poorly constrained. In this paper, we report new data on H2O and trace element mass fractions and single‐cryst...

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Bibliographic Details
Published in:Geostandards and geoanalytical research 2023-09, Vol.47 (3), p.595-608
Main Authors: Liu, Yujie, Yang, Wenqiang, Zhang, Chao, Bao, Zhian, Wu, Shitou, Almeev, Renat R., Ridolfi, Filippo, Oberti, Roberta
Format: Article
Language:English
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Summary:The amphiboles from Kakanui and Arenal are two natural minerals that have been used worldwide as microanalytical reference materials, but their compositions and crystal structures are still poorly constrained. In this paper, we report new data on H2O and trace element mass fractions and single‐crystal structural refinement of these two amphiboles. H2O mass fractions of the Kakanui and Arenal amphiboles determined via Karl‐Fischer titration are 0.92 ± 0.18 (2s) and 1.56 ± 0.22% m/m (2s), respectively; these values estimated based on crystal‐structure refinement are 0.86 and 1.46% m/m, respectively. Trace element mass fractions measured via LA‐ICP‐MS in two laboratories are in good agreement, and spots from five fragments for both Kakanui and Arenal amphiboles are generally consistent within reproducibility precision (2s). Our measurements indicate a better homogeneity for the amphiboles from Kakanui than that from Arenal. According to the latest scheme for amphibole classification and nomenclature (Hawthorne et al. 2012), the sample from Arenal is a (partially dehydrogenated) pargasite, and that from Kakanui is a kaersutite. The significant amount of oxo‐component and that CTi4+ content is strongly ordered at the M(1) site for both amphiboles indicate crystallisation under high fO2 conditions. Key Points Major (including H2O) and trace element mass fractions of the Smithsonian amphibole reference materials from Kakanui and Arenal have been remeasured. Crystal‐structure refinement has been performed for both amphibole materials. Both the Kakanui and Arenal amphiboles show good homogeneity that allows their use as reference materials for multiple microanalytical techniques.
ISSN:1639-4488
1751-908X
DOI:10.1111/ggr.12486