... Juan County, Utah, USA. It occurs with natrozippeite, brochantite, devilline, posnjakite, johannite, gypsum, bobcookite, pickeringite, pentahydrite and the NH 4 -analogue of zippeite: ammoniozippeite. Redcanyonite occurs as radial aggregates of red–orange needles and blades individually reaching up...

... repository for nuclear waste. Three members of the uranyl sulfate zippeite group, natrozippeite, cobaltzippeite, and zinczippeite, were synthesized and characterized prior to determination of their standard state enthalpies of formation from binary oxides and from elements using high-temperature drop...

...Jakub Plášil; Pavel Škácha; Jiří Sejkora; Anthony R. Kampf; Radek Škoda; Jiří Čejka; Jan Hloušek; Anatoly V. Kasatkin; Radim Pavlíček; Karel Babka Abstract The new mineral plavnoite (IMA2015-059), ideally K 0.8 Mn 0.6 [(UO 2 ) 2 O 2 (SO 4 )]·3.5H 2 O, is a member of the zippeite group. It was found...

... to the zippeite group of minerals, as it is based upon the structural sheets of the zippeite topology of composition [(UO 2 ) 4 O 4 (SO 4 ) 2 ] 4− . Located in the interlayer between the sheets, which are stacked perpendicular to [010], are Ca 2+ cations and H 2 O groups. Ca 2+ ions are [7]-coordinated, by three...

...Jakub Plášil; Stuart J. Mills; Karla Fejfarová; Michal Dušek; Milan Novák; Radek Škoda; Jiří Čejka; Jiří Sejkora Abstract The crystal structure of natural zippeite, K 1.85 H + 0.15 [(UO 2 ) 4 O 2 (SO 4 ) 2 OH 2 ](H 2 O) 4 , from Jáchymov, Czech Republic, has been determined by single-crystal X-ray...

...Jakub Plášil; Michal Dušek; Milan Novák; Jiří Čejka; Ivana Císařová; Radek Škoda Abstract Sejkoraite-(Y), the triclinic (Y 1.98 Dy 0.24 ) ∑2.22 H 0.34 + [(UO 2 ) 8 O 88 O 7 OH(SO 4 ) 4 ](OH)(H 2 O) 26 , is a new member of the zippeite group from the Červená vein, Jáchymov (Street...

...O. Maurice Peeters; Renaud Vochten; Norbert Blaton Abstract Mixed K– Me zippeite-group phases ( Me = Mn, Co, Ni, Zn) have been synthesized by adjusting a UO 2 SO 4 solution containing Me SO 4 to a pH of 3.8 by means of KOH. The solution was kept for 75 hours at 150°C and an approximate pressure...

... reflections extracted from the powder diffractogram. Pseudojohannite contains zippeite-type layers oriented parallel to (1̅01). The empirical chemical formula calculated for a total of 70 O atoms is Cu 6.52 U 7.85 S 4.02 O 70 H 55.74 , leading to the simplified chemical formula Cu 6.5 [(UO 2 ) 4 O 4 (SO 4 ) 2...

...Peter C. Burns; Kathryn M. Deely; Leslie A. Hayden Abstract Single crystals of eight zippeite-group compounds have obtained using mild hydrothermal synthesis techniques. The structure of each has been determined with single-crystal diffraction data collected using Mo K α X-radiation and an APEX CCD...

.... The zippeite-group of minerals is one of the most common and diverse in such settings. To decipher the nature and crystal chemistry of the zippeite-group, the crystal structure of a new natural hydrated Mg uranyl sulfate related to Mg-zippeite was determined. The mineral is named marecottite after the type...