Articles | Volume 32, issue 4
Eur. J. Mineral., 32, 427–441, 2020
https://doi.org/10.5194/ejm-32-427-2020
Eur. J. Mineral., 32, 427–441, 2020
https://doi.org/10.5194/ejm-32-427-2020

Research article 30 Jul 2020

Research article | 30 Jul 2020

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

Herbert Kroll et al.

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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.