Summary
The water content of nephelines from various localities were studied through thermal weight loss and single-crystal infrared spectroscopy. Typical water contents in nepheline are on the order of 0.2 to 0.5 wt. . The H2O molecule exists in multiple crystallographic orientations, presumably in the potassium site. Two orientations of water are indicated in the spectrum of nepheline from Monte Somma. When the crystal is heated to 350°C, a third orientation develops.
Zusammenfassung
Der Wassergehalt von Nephelinen verschiedener Vorkommen wurde über Glühverlustsbestimmung und Einkristall-Infrarotspektroskopie untersucht. Charakteristische Wassergehalte liegen in Nephelinen zwischen 0,2 und 0,5 Gew. %. Das vermutlich in der K-Position liegende H2O-Molekül kommt in verschiedenen kristallographischen Orientierungen vor. Aus dem Spektrum eines Nephelins von Monte Somma ergeben sich zwei Arten der Wasser-Orientierung. Nach Erhitzen des Kristalls auf 350°C entsteht eine dritte Orientierung.
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Beran, A., Rossman, G.R. The water content of nepheline. Mineralogy and Petrology 40, 235–240 (1989). https://doi.org/10.1007/BF01164492
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DOI: https://doi.org/10.1007/BF01164492