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Published online by Cambridge University Press: 14 March 2018
1 Min. Mag., 1957, vol. 31, p. 587.
2 Ibid., 1955, vol. 30, p. 687.
3 Comun. Serv. Geol. Portugal, 1936, vol. 19, pp. 154-156 [M.A. 6-440 (anal. XIV)].
4 Min. Mag., 1956, vol. 31, p. 346.
5 M. H. Hey, An Index of Mineral Species, 2nd edn, London, 1955, item 22.1.12, p. 262.
6 Dana's System of Mineralogy, 7th edn, vol. 2, 1951, p. 847.