On the existence of monoclinic NaAlSi3O8 s at elevated temperatures
- 14 March 1967
- journal article
- Published by Mineralogical Society in Mineralogical Magazine and Journal of the Mineralogical Society
- Vol. 36 (277), 83-88
- https://doi.org/10.1180/minmag.1967.036.277.13
Abstract
Summary: Measurements from powder diffraction patterns recorded at temperatures up to 950° C for the supposed equilibrium forms of albite synthesized at 800°, 900°, and 1000° C by MacKenzie (1957) indicate that only the form synthesized at 1000° C becomes monoclinic. Single-crystal measurements on heated pure natural albite (Ab99·26) show that it becomes truly monoclinic, both in geometry and intensity distribution, at 930° C, the same temperature as for the highest-temperature synthetic form. These experiments were carried out in conditions that exclude possible contamination by potassium.Keywords
This publication has 3 references indexed in Scilit:
- A reinterpretation of monalbiteMineralogical Magazine and Journal of the Mineralogical Society, 1967
- Lattice changes in heat-treated plagioclases The existence of monalbite at room temperatureZeitschrift für Kristallographie, 1960
- The crystalline modifications of NaAlSi 3 O 8American Journal of Science, 1957