Synthesis and thermal stability of 2 frac{1}{2}-octahedral sodium mica,NaMg2.5 (OH)2∫i4O10] |
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| Authors: | Gerhard Franz Prof. Dr. Egon Althaus |
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| Affiliation: | 1. Mineralogisches Institut der Universit?t Karlsruhe, Kaiserstr. 12, D-7500, Karlsruhe 1, Germany
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| Abstract: | A new 2 (frac{1}{2}) -octahedral sheet silicate, NaMg2.5 Si4O10 (OH)2, has been synthesized from oxide mixtures in the temperature range 500–600°C at pressures between 1 and 5 kb. The lattice parameters are a 0 = 5.298 Å, b 0 = 9.047 Å, c 0 = 9.479 Å and ß=99.55°. X-ray data are given in the text. At temperatures above 605° C/1 kb and 630° C/5 kb, it decomposes to magnesiorichterite plus quartz. |
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