Abstract
The conditions of formation of malayaite, CaSnOSiO4, were studied via hydrothermal synthesis, and the region of the solid solution between malayaite and sphene determined. It was found that the immiscible region exists at temperatures lower than 615°±15°C. The peak of the solvus was experimentally determined to be Ca(Sn1/4Ti3/4)OSiO4. X-ray powder diffraction patterns of the solid solution showed a successive change from malayaite to sphene with the change of composition. The relation between the d(200) and d(002) values and the tin content of the solid solution was found to be linear. The occurrence is reported of malayaite from pyrometasomatic ore deposits in south-western Japan. It is concluded that malayaite would have been formed in the front of skarn, in the quartz or calcite veinlets cutting skarn, and in the altered zones of tin-bearing minerals.
Zusammenfassung
Die Bildungsbedingung von Malayait, CaSnOSiO4, wurde durch hydrothermale Synthese untersucht, und das Gebiet der festen Lösung zwischen Malayait und Titanit bestimmt. Es ergibt sich, daß das heterogene Gebiet unterhalb 615°±15°C liegt. Der höchste Punkt des Solvus wurde als Ca(Sn1/4Ti3/4)OSiO4 bestimmt. Die röntgenographischen Diffraktionsfiguren der festen Lösung zeigen einen kontinuierlichen Übergang von Malayait zu Titanit, der dem Wechsel der Zusammensetzung entspricht. Das Verhältnis zwischen dem d(200)- und d(002)-Wert und den Mol-Prozenten von Zinn der festen Lösung werden in Diagrammen geradlinig dargestellt. Von pyrometasomatischen Lagerstätten in Südwestjapan werden neue Vorkommen von Malayait gemeldet. Aus den Untersuchungen folgt, daß Malayait sich in den Rändern von Skarnzonen, in Quarz- oder Calcit-Adern, die Skarn schneiden, und in Umwandlungszonen mit Zinn-Mineralien befinden.
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Takenouchi, S. Hydrothermal synthesis and consideration of the genesis of malayaite. Mineral. Deposita 6, 335–347 (1971). https://doi.org/10.1007/BF00201891
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DOI: https://doi.org/10.1007/BF00201891