Crystal Chemistry of Lead Oxide Hydroxide Nitrates I. The Crystal Structure of [Pb6O4](OH)(NO3)(CO3)

Li, Yaping; Krivovichev, Sergey V.; Burns, Peter C.

doi:10.1006/jssc.2000.8784

Cited by 49 publications

(21 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The description of structures of minerals and inorganic compounds in terms of anion-centered tetrahedra provides a useful tool for understanding occurrences of complex minerals such as those in the fumaroles of the Tolbachik volcano. For further references on anion-centered tetrahedra, see Krivovichev et al (1998bKrivovichev et al ( , 2001), Krivovichev & Burns (2000a, b, 2001a, b, 2002, Li et al (2000Li et al ( , 2001, Hawthorne et al (2000) and Krivovichev & Filatov (2001).…”

Section: Discussionmentioning

confidence: 99%

NEW Cu2+ COORDINATION POLYHEDRA IN THE CRYSTAL STRUCTURE OF BURNSITE, KCdCu7O2(SeO3)2Cl9

Burns¹,

Krivovichev²,

Филатов³

2002

The Canadian Mineralogist

View full text Add to dashboard Cite

The crystal structure of burnsite, KCdCu 7 O 2 (SeO 3) 2 Cl 9 , a new mineral species from fumaroles of the Tolbachik volcano, Kamchatka, Russia, has been solved by direct methods and refined on the basis of F 2 for all unique data collected with monochromatic MoK␣ X-radiation and a CCD (charge-coupled device) detector to an agreement factor (R1) of 1.9%, calculated using the 460 unique observed reflections (|F o | = 4 F). The mineral is hexagonal, space group P6 3 /mmc, a 8.7805(8), c 15.521(2) Å, V 1036.3(2) Å 3 , Z = 2. There are two non-equivalent Cu 2+ cations in the structure of burnsite. The Cu(1) cation is coordinated by three atoms of O and three of Cl; this is the first example of this type of mixed-ligand Cu 2+ 6 (: O 2-, Cl-) octahedron in a mineral. The octahedron is (2 + 4)-distorted owing to the Jahn-Teller effect, in contrast to the vast majority of Cu 2+ oxysalt minerals that contain (4 + 2)-distorted Cu 2+ octahedra. The Cu(2) cation is coordinated by two O and three Cl anions arranged at the vertices of a trigonal bipyramid; this is the first occurrence of a mixed-ligand Cu 2+ O 2 Cl 3 trigonal bipyramid in a mineral. The single symmetrically independent Cd 2+ cation is coordinated by six Cl anions located at the vertices of a regular octahedron. The structure contains one symmetrically independent K cation that is coordinated by six Cl anions in a trigonal prismatic arrangement. There is one unique Se 4+ cation that is strongly bonded to three O anions on one side of the cation, owing to the presence of a s 2 lone-electron pair. The structure is described both in terms of cation-centered polyhedra and oxocentered OCu 4 tetrahedra. The structure of burnsite is closely related to the structures of other natural copper oxide chloride selenites discovered in the Tolbachik fumaroles (chloromenite, georgbokiite, ilinskite).

show abstract