Mixites and petersites: New Data on the Structure of Agardite-(Ce)

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Resumo

Arsenates and phosphates are rare although challenging minerals of the mixite group. Their general formula is ACu6(TO4)3–x(TO3OH)x(OH)6·3H2O, where A = REE, Ca, Pb, Bi3+, Al; T = As5+, P5+; x = 0–1, hexagonal cell parameters a ≈ 13.5 Å, c ≈ 6 Å, V ≈ 900 Å3, and space group P63/m or P63. There are two subgroups in accordance with chemical composition in T-sites: mixite (T = As) and petersite (T = P). Agardit-(Ce) CeCu6(AsO4)3(OH)6·3H2O from Clara Mine, Schwarzwald, Germany, has been investigated. Unit-cell parameters of agaradite-(Ce) are: a = 13.598(6) Å, c = 5.954(3) Å; V = 953.5(2) Å3; space group P63/m. The structure has been specified and refined to final R = 3.87% for 786 I > 3σ(I). For the first time in the structure of minerals of mixite group hydrogen atoms have been localized and hydrogen bonding has been characterized.

Sobre autores

R. Rastsvetaeva

Shubnikov Institute of Crystallography, RAS

Email: rast.crys@gmail.com
Moscow, Russia

S. Aksenov

Shubnikov Institute of Crystallography, RAS

Email: aks.crys@gmail.com
Moscow, Russia

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