...Howard T. Evans, Jr.; Clifford Frondel Abstract Liebigite, Ca 2 U(CO 3 ) 4 · 10H 2 O, from Joachimsthal, Bohemia, has a 0 16.71 Å, b 0 17.55, c 0 13.79; a 0 : b 0 : c 0 = 0.952:1:0.786 ( a:b:c = 0.9539:1:0.7826, morphology, Brezina, 1890). Space group Bbam or Bba. Cell contents 8[Ca 2 U(CO 3 ) 4...

...Esper S. Larsen Abstract The available descriptions of uranothallite and liebigite indicate them to be very similar, except in chemical composition. Three fairly satisfactory analyses of uranothallite are available and the composition must be near 2CaO.UO 3 .3CO 2 .10H 2 O. The only published...

... and schoepite. Uranyl tricarbonate minerals such as liebigite precipitate on calcite only in more highly concentrated basic solutions. The crystal morphologies of almost all of these minerals were recorded on the calcite surface with an atomic force microscope (AFM). Red crystals of becquerelite grown in acidic...

.... In Beshtau, it occurs as yellow tabular crystals up to 0.3 mm grouped in crusts on a matrix composed of albite, microcline, quartz, and chamosite in association with liebigite, meta-autunite, and plumbogummite. The empirical formula calculated on the basis of 6 O apfu and 3 H 2 O is [ ( NH 4 ) 0.91 K 0.08...

...Fig. 7. The structures of markeyite and liebigite viewed parallel to the heteropolyhedral layers. UO 8 hexagonal bipyramids are dark blue, CO 3 triangles are yellow and Ca–O polyhedra are light blue; O atoms of isolated H 2 O groups are white balls. Unit cell outlines are shown as dashed black...

... minerals including tyuyamunite, uranophane, bayleyite, andersonite, schoepite, liebigite, swarlzite, and schroeckingerite have been identified. Azurite and malachite are also associated in some of the uranium occurrences in Lower Siwaliks. The sedimentological, geochrmical, and tectonic attributes...

... are briefly considered. Of them, liebigite (= uranothallite) and schroeckingerite are well established. Voglite is almost certainly valid; randite certainly, and rutherfordine probably, are to be discredited; sharpite may be valid; the status of studtite and diderichite is very doubtful. * Published...

...Table 6. Information measures ( I G ) for markeyite, natromarkeyite, pseudomarkeyite, paramarkeyite and liebigite including H atoms. Mineral V v I G I G,total (Å 3 ) (Å) (bits/atom) (bits/cell) Markeyite 3356 340 5.83 1983.19 Natromarkeyite 3346...

...F igure 2. EXAFS (left) and FT (right) spectra for ( a ) liebigite, ( b ) čejkaite, and ( c ) the aqueous complex \batchmode \documentclass[fleqn,10pt,legalpaper]{article} \usepackage{amssymb} \usepackage{amsfonts} \usepackage{amsmath} \pagestyle{empty} \begin{document} \(UO_{2}(CO_{3})_{3...

...Fig. 9. Heteropolyhedral layer in the structure of liebigite viewed down [010]. The unit cell is outlined with dashed lines. ...

.... Ewingite forms aggregates of golden-yellow crystals as large as 0.2 mm in diameter on altered uraninite, and is associated with other uranyl carbonate minerals, including liebigite and metazellerite ( Fig. 1 ). Uranyl minerals, including ewingite, are typically various shades of yellow, green, and orange...