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The Canadian Mineralogist; February 1996; v. 34; no. 1; p. 55-59
© 1996 Mineralogical Association of Canada
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Jensenite, a cupric tellurate framework structure with two coordinations of copper

Joel D. Grice, Lee A. Groat, and Andrew C. Roberts

Canadian Museum of Nature, Research Division, Ottawa, ON, Canada
University of British Columbia, Canada
Geological Survey of Canada, Canada

The crystal structure of jensenite, Cu (super 2+) 3 Te (super 6+) O 6 .2H 2 O, has been determined and refined to indices R = 3.3 and R w = 2.5%. The structure is monoclinic, P2 1 /n (14), with cell parameters a 9.224(2), b 9.180(1), c 7.600(1) Aa, beta 102.38(1) degrees , V 628.5(2) Aa 3 , with Z = 4. The structure analysis was essential in determining the valence state of Cu (super 2+) and Te (super 6+) and the number of O (super 2-) atoms and H 2 O groups in the formula. The crystal structure of jensenite contains a sheet of fully occupied edge-sharing [CuO 6 ] and [TeO 6 ] octahedra. These (101) sheets are bonded together through [Cu 2 phi 8 ] dimers (where phi represents either O atoms or H 2 O groups). The dimers contain two H 2 O groups, which reinforce the intersheet linkages via H-bonding. The hexagonal closest packed (HCP) layering in jensenite differs from that in other synthetic and natural cupric tellurates in either the sequence of stacking or the composition of the layers.

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