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The crystal structure of Ba2F2(S6+O3S2–), a natural thiosulphate weathering product of old smelting slags at the Surrender Mill, Yorkshire, UK

Published online by Cambridge University Press:  05 July 2018

A. R. Kampf
A. R. Kampf*
Affiliation:
Mineral Sciences Department, Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, CA 90007, USA
*
* E-mail: akampf@nhm.org
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Abstract

The crystal structure of Ba2F2(S6+O3S2–), a natural thiosulphate weathering product of old smelting slags at the Surrender Mill, Yorkshire, England, UK, has been solved to R1 = 0.88% for 399 unique [Fo > 4α F] reflections and 0.91% for all 407 reflections. The compound is monoclinic, C2/m, a 15.3172(5), b 4.5898(1), c 4.6320(2) Å, β 101.449(1)º, V 319.17(2) Å3. The structure of Ba2F2(S6+O3S2–) consists of BaF2Ba layer fragments of the fluorite-type structure of frankdicksonite (BaF2) parallel to (100) alternating with layers of thiosulphate groups. The layer sequence in one unit cell is (S6+O3S2–)-BaF2Ba-(S6+O3S2–)-BaF2Ba. The structure resembles that of grandreefite, Pb2F2SO4.

Keywords

thiosulphateweathering productfrankdicksoniteEngland.
Type
Research Article
Information
Mineralogical Magazine , Volume 73 , Issue 2 , April 2009 , pp. 251 - 255
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2009

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