Agardite-(Y), Cu2+ 6Y(AsO4) 3(OH)6·3H2O

Shaunna M. Morrison, Kenneth J. Domanik, Marcus J. Origlieri, Robert T. Downs

Research output: Contribution to journalArticle

4 Scopus citations

Abstract

Agardite-(Y), with a refined formula of Cu2+ 5.70(Y0.69Ca0.31)[(As0.83P 0.17)O4]3(OH)6·3H2O [ideally Cu2+ 6Y(AsO4)3(OH) 6·3H2O, hexacopper(II) yttrium tris(arsenate) hexahydroxide trihydrate], belongs to the mixite mineral group which is characterized by the general formula Cu2+ 6A(TO4) 3(OH)6·3H2O, where nine-coordinated cations in the A-site include rare earth elements along with Al, Ca, Pb, or Bi, and the T-site contains P or As. This study presents the first structure determination of agardite-(Y). It is based on the single-crystal X-ray diffraction of a natural sample from Jote West mine, Pampa Larga Mining District, Copiapo, Chile. The general structural feature of agardite-(Y) is characterized by infinite chains of edge-sharing CuO5 square pyramids (site symmetry 1) extending down the c axis, connected in the ab plane by edge-sharing YO9 polyhedra (site symmetry -6..) and corner-sharing AsO4 tetrahedra (site symmetry m..). Hydroxyl groups occupy each corner of the CuO5-square pyramids not shared by a neighboring As or Y atom. Each YO9 polyhedron is surrounded by three tubular channels. The walls of the channels, parallel to the c axis, are six-membered hexagonal rings comprised of CuO5 and AsO4 polyhedra in a 2:1 ratio, and contain free molecules of lattice water.

Original languageEnglish (US)
Pages (from-to)i61-i62
JournalActa Crystallographica Section E: Structure Reports Online
Volume69
Issue number9
DOIs
StatePublished - Sep 1 2013

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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