European Journal of Mineralogy
European Journal of Mineralogy
European Journal of Mineralogy
Articles | Volume 36, issue 4
Articles | Volume 36, issue 4
https://doi.org/10.5194/ejm-36-657-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/ejm-36-657-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 36, issue 4
Review article
 | 
30 Aug 2024
Review article |  | 30 Aug 2024

The composition of metapelitic biotite, white mica, and chlorite: a review with implications for solid-solution models

Benoît Dubacq and Jacob B. Forshaw

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Short summary
This article reviews the crystal chemistry of chlorite, biotite, and white mica in metamorphosed sediments. These minerals have complex compositions because many atom exchanges may take place in their structure. Such exchanges include easily measured cations but also structurally bound H2O, notoriously hard to measure; iron oxidation; and vacancies. Consequently, formula units are often calculated from incomplete measurements and some exchanges may appear solely due to normalization issues.
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