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Mineralogical ClassificationJaguéite and chrisstanleyite: structures determination

1st Jul 2006 08:03 UTCMarco E. Ciriotti Manager

Reference:

• Topa, D., Makovický, E., Balić-Žunić, T. (2006): The crystal structures of jaguéite, Cu2Pd3Se4, and chrisstanleyite, Ag2Pd3Se4. Canadian Mineralogist, 44, 497-505.


Abstract:

The crystal structure of jaguéite, ideally Cu2Pd3Se4, monoclinic, a 5.672(5), b 9.909(9), c 6.264(6) Å, β 115.40(2)º, space group P21/c, has been solved by direct methods and refined to an R1 index of 5.52% for 956 unique reflections measured with MoKα X-radiation on a P–4 Bruker diffractometer equipped with a CCD area-detector. The crystal structure of chrisstanleyite, ideally Ag2Pd3Se4, monoclinic a 5.676(2), b 10.342(4), c 6.341(2) Å, β 114.996(4)º, space group P21/c, has been solved by direct methods and refined to an R1 index of 8.3% for 1203 unique reflections measured with MoKα X-radiation. There are two unique Pd sites, one Cu (or Ag) and two Se sites in the unit cell. Atom Pd1 forms isolated square arrangements PdSe4, whereas the adjacent arrangements involving Pd2 are paired via a common edge. The (Cu,Ag) coordination tetrahedra form (100) layers which, together with the Pd2–Cu(Ag)–Pd1–Cu(Ag)–Pd2 system of metal–metal bonds, help to stabilize the open-work structure composed of PdSe4 squares.
 
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