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The crystal structure of Ba₂F₂(S⁶⁺O₃S^2-), a natural thiosulphate weathering product of old smelting slags at the Surrender Mill, Yorkshire, UK

Mineral Sciences Department, Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, CA 90007, USA

^* E-mail: akampf{at}nhm.org

The crystal structure of Ba₂F₂(S⁶⁺O₃S^2-), 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 [F_o > 4 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)°, V 319.17(2) ų. The structure of Ba₂F₂(S⁶⁺O₃S^2-) 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⁺O₃S^2-)-BaF₂Ba-(S⁶⁺O₃S^2-)-BaF₂Ba. The structure resembles that of grandreefite, Pb₂F₂SO₄.

KEYWORDS: thiosulphate, weathering product, frankdicksonite, England