Sejkoraite-(Y), a new member of the zippeite group containing trivalent cations from Jáchymov (St. Joachimsthal), Czech Republic: Description and crystal structure refinement.

• Authors: PLÁŠIL Jakub; DUŠEK Michal; NOVÁK Milan; ČEJKA Jiří; CÍSAŘOVÁ Ivana; ŠKODA Radek
• Year of publication: 2011
• Type: Article in Periodical
• Magazine / Source: American Mineralogist
• MU Faculty or unit: Faculty of Science
• Doi: https://doi.org/10.2138/am.2011.3713
• Field: Solid matter physics and magnetism
• Keywords: sejkoraite-(Y); new mineral; uranyl; zippeite group; crystal structure; vibration spectroscopy; Jáchymov
• Description: Sejkoraite-(Y) is a new member of the zippeite group from the Cervená vein, Jáchymov (Street Joachimsthal) ore district, Western Bohemia, Czech Republic. It grows on altered surface of relics of primary minerals: uraninite, chalcopyrite, and tennantite. The crystal structure of sejkoraite-(Y) has been solved by the charge flipping method from single-crystal X-ray diffraction data and refined to Robs = 0.060 with GOFobs = 2.38, based on 6511 observed reflections. Raman and infrared spectra of sejkoraite-(Y) are discussed.

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