Hostname: page-component-cd9895bd7-dzt6s Total loading time: 0 Render date: 2024-12-28T04:01:50.699Z Has data issue: false hasContentIssue false
  • English
  • Français

Some manganese oxide pseudomorphs

Published online by Cambridge University Press:  14 March 2018

R. J. Davis
R. J. Davis*
Affiliation:
Department of Mineralogy, British Museum (Natural History), Cromwell Road, London, S.W. 7
Get access Rights & Permissions [Opens in a new window]

Summary

Pyrolusite pseudomorphous after manganite occurs at Serro do Navio, Amapa, Brazil. It consists of wedges, flattened on (100) and elongated along [010], twinned on (011) and showing forms d{210}, , b{010}, and f{021} (all indices referred to manganite, in the setting of Dana, 7th edn). The difficulty of distinguishing between pyrolusite pseudomorphous after manganite and after groutite is discussed and also the possible existence of the latter. The distinction was made here by measuring the twinning angle between the pyrolusite lattices using (0kl) precession photographs. Specimens of manganite intergrown with pyrolusite are described and their relative orientations determined. On heating, manganite partly decomposes to a monoclinic phase, a 9·9 Å, b 5·73 Å, c 4·89 Å, β 98°, space group I2, Im, or I2/m.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 36 , Issue 278 , June 1967 , pp. 274 - 279
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1967

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Bragg, (Sir L.) and Claringbull, (G. F.), 1965. The Crystalline State: vol. IV, Crystal Structures of Minerals, G. Bell, London, p. lll.Google Scholar
Buerger, (M. J.), 1936. Zeits. Krist., vol. 95, pp. 163–174.Google Scholar
Dasgupta, (D. R.), 1965. Min. Mag., vol. 35, pp. 131–139.Google Scholar
Dent Glasser, (L. S.) and Smith, (I. B.), 1965. Ibid., pp. 327-334.Google Scholar
Fleischer, (M.), Richmond, (W. E.), and Evans, (H. T.), 1962. Amer. Min., vol. 47, pp. 47–58.Google Scholar
Goldschmidt, (V.), 1918. Atlas der Krystallformen, Heidelberg, vol. 5, pp. 191–197. tables 119-122.Google Scholar
Gruner, (J. W.), 1947. Amer. Min., vol 32, pp. 654–659.Google Scholar
Klingsberg, (C.) and Roy, (R.), 1959. Ibid., vol. 44, pp. 819-838.Google Scholar
Mattieson, (A. McL.) and Wadsley, (A. D.), 1950. Ibid., vol. 35, pp. 99-101.Google Scholar
Palache, (C.), Berman, (H.), and Frondel, (C.), 1944. Dana's System of Mineralogy, 7th edu, Wiley, New York, vol. 1, pp. 646–649.Google Scholar
Segeler, (C. G.), 1959. Amer. Min., vol. 44, pp. 877–878.Google Scholar
Strunz, (H.), 1943. Naturwiss., vol. 31, pp. 89–91.Google Scholar
Weisbach, (–), 1858. Dissert. Heidelberg, table 4, fig. 54, quoted by Goldsehmidt (ref. above).Google Scholar