Abstract
A SPECIMEN of psilomelane (BM.69,160) from Schneeberg, Saxony, was kindly made available for examination by the Department of Mineralogy, British Museum (Natural History). This material forms minute monoclinic crystals with a = 9.56, b = 2.88, c = 13.85 A., β = 92° 30′, probable space group A 2/m. These values are a refinement of those previously reported by Vaux1. The unit cell contains two empirical formula units, Ba0.64(Mn,R)5O10.1.36 H2O, giving dcalc. = 4.82, dobs. = 4.71; the ions R comprise Mn2+ and traces of other metals substituted for Mn4+.
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References
Vaux, Min. Mag., 24, 521 (1937).
Byström and Byström, Acta Cryst., 3, 146 (1950).
Byström and Byström, Acta Cryst., 4, 469 (1951).
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WADSLEY, A. Role of Water in the Structure of Psilomelane, (Ba,H2O)2Mn5O10. Nature 170, 973–974 (1952). https://doi.org/10.1038/170973a0
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DOI: https://doi.org/10.1038/170973a0
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