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A ferric iron equivalent of hematolite from Sterling Hill, New Jersey and Långban, Sweden

Published online by Cambridge University Press:  05 July 2018

Pete J. Dunn  and
Donald R. Peacor
Pete J. Dunn
Affiliation:
Department of Mineral Sciences, Smithsonian Institution, Washington DC 20560
Donald R. Peacor
Affiliation:
Department of Geological Sciences, University of Michigan, Ann Arbor Michigan 48109
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Abstract

An unnamed Fe3+ analogue of hematolite is described from Sterling Hill, New Jersey and Långban, Sweden. Eight microprobe analyses are in good agreement with ratios derived from a prior analysis which yielded: Al2O3 0.24, Fe2O3 10.85, MgO 10.61, MnO 41.76, As2O3 6.65, As2O5 15.29, H2O 13.23 (rem. = 1.63), sum = 100.26 %. Single-crystal study indicated that this compound is hexagonal with a = 8.28 Å, but the value of c could not be well-defined due to complex polytypism giving rise to diffuse and poorly resolved reflections along c*. In one case, a value of c = 72.69 Å was dominant. All values that could be determined were multiples of approximately 12 Å. The strongest lines in the X-ray powder diffraction pattern are: 2.400(100), 1.563(100), 6.09(80), 3.42(50), and 5.13(50). This compound is dark red and occurs as platy hexagonal crystals in clusters associated with a wide variety of species in varied assemblages. It remains unnamed because of the ambiguity arising from polytypism.

Type
Research Article
Information
Mineralogical Magazine , Volume 47 , Issue 344 , September 1983 , pp. 381 - 385
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1984

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References

Araki, T., and Moore, P. B. (1981) Am. Mineral. 66, 1263–73.Google Scholar
Berry, L. G., and Graham, A. R. (1948) Ibid. 33, 489–95.Google Scholar
Dunn, P. J., and Nelen, J. A. (1980) Ibid. 65, 957–60.Google Scholar
Dunn, P. J. and Sturman, B. D. (1982) Ibid. 67, 841–5.Google Scholar
Peacor, D. R., Nelen, J. A., and Norberg, J. A. (1981) Ibid. 66, 1054–62.Google Scholar
Moore, P. B., and Araki, T. (1978) Ibid. 63, 150–9.Google Scholar
Sjogren, Hj. (1885) Z. Krystallogr. 10, 113–55.Google Scholar
Wickmann, F. E. (1950) Geol. Form. Fork. Stockholm. 72, 64–8.CrossRefGoogle Scholar