European Journal of Mineralogy
European Journal of Mineralogy
European Journal of Mineralogy
Articles | Volume 32, issue 4
Articles | Volume 32, issue 4
https://doi.org/10.5194/ejm-32-427-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/ejm-32-427-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 32, issue 4
Research article
 | 
30 Jul 2020
Research article |  | 30 Jul 2020

Na-feldspar: temperature, pressure and the state of order

Herbert Kroll, Hans Ulrich Bambauer, and Horst Pentinghaus

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Short summary
Feldspars constitute about 60 % of the earth's crust. Na-feldspar, Na[AlSi3O8], is central to this mineral group. Its structural response to changing conditions of temperature and pressure is complicated. In particular, this applies to the distribution of Al and Si on the atomic sites of its crystal structure. We clarify how this distribution varies in thermodynamic equilibrium with external conditions and provide procedures that allow easy determination of the atomic distribution.
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