Heat Treatment of Metamict Euxenites, Polymignites, Yttrotantalites, Samarskites, Pyrochlores, and Allanites

J. Lima-de-Faria
Mineralogical Museum, Section of the Junta de Investigações do Ultramar, Faculty of Science, Lisbon, Portugal.

Summary: The standard thermal treatments proposed by Lima-de-Faria have been applied to metamict euxenites, polymignites, yttrotantalites, samarskites, pyrochlores, and allanites. In the case of these metamict niobotantalates a facecentred cubic phase is formed at 700° C., and at 1000°C. a more characteristic phase appears combined with the cubic one. In the case of allanites only a slight formation or strengthening of the original structure of allanite appears at 700°C., and at 1000°C. a cubic phase is formed together with other phases.

Mineralogical Magazine; September 1958 v. 31; no. 242; p. 937-942; DOI: 10.1180/minmag.1958.031.242.06
© 1958, The Mineralogical Society
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