Infrared spectra of liebigite, andersonite, voglite and schroeckingerite

Abstract

Infrared spectra of mineral possessing layer structure - liebigite, Ca2[UO2(CO3)3].(8-11) H2O, schroeckingerite, NaCa3[UO2(CO3)3]SO4F.10 H2O, voglite, Ca2Cu[UO2(CO3)4].6 H2O (?), and synthetic andersonite, Na2Ca[UO2(CO3)3].6 H2O - were measured and interpreted and compared with the published infrared spectra of ammonium, potassium, rubidium, and cesium dioxo-tricarbonatouranates(VI). From the analysis of the infrared spectra it follows - in accordance with the results of X-ray diffraction analysis - that in the dioxo-tricarbonatouranate(VI) complex anion, [UO2(CO3)3]4-, forming hexagonal bipyramid, three bidentately bonded carbonate groups are present in the equatorial plane (in liebigite and andersonite and apparently also in schroeckingerite and voglite). The coordinations of the SO42- and F- ions in schroeckingerite and of the fourth carbonate group (?) in voglite have not been elucidated.

Raman spectroscopic study of the uranyl carbonate mineral voglite

“…40,41 Some infrared data has been published. 5,18,42,43 The aim of this paper is to present Raman and infrared spectra of voglite and to relate the spectra to the structure of the mineral. The paper is a part of systematic studies of vibrational spectra of uranyl minerals of secondary origin in the oxide supergene zone and their synthetic analogs.…”

“…Included in these are many uranyl carbonates. [4][5][6] These uranyl carbonates may be divided into those based upon tricarbonates and those with single carbonate in the formula such as rutherfordine UO 2 CO 3 7-9 and blatonite UO 2 CO 3 .H 2 O. 10 Sharpite is a basic uranyl carbonate Ca(UO 2 ) 6 (CO 3 ) 5 (OH) 4 .6H 2 O.…”

“…Among the uranyl carbonates is the mineral voglite a copper containing uranyl carbonate with a formula of some uncertainty. 5,16 Voglite is a uranyl carbonate of formula Ca 2 Cu 2+ [(UO 2 )(CO 3 ) 3 ](CO 3 ).6H 2 O and is a rare mineral resulting from the oxidation of uraninite. 5,[17][18][19][20] The mineral is monoclinic, probable space group P2 1 or P2 1 /m 21 .…”

EPR and optical absorption spectral studies on voglite mineral

“…[1][2][3][4]. The study of the uranyl carbonates was undertaken since a long time due to its wide distribution [5,6].…”

“…Uranyl carbonates may be classified into tri-carbonates and a mono/single-carbonates. Uranyl carbonate mineral voglite is a rare mineral resulting from the oxidation of uraninite with a formula of some uncertainty is given as Ca 2 Cu 2 [(UO 2 )(CO 3 ) 3 ](CO 3 )6H 2 O [3,[7][8][9][10][11]. The mineral is monoclinic, with cell dimensions a = 25.97, b = 24.5, c = 10.7 Å and with probable space group P2 1 or P2 1 /m.The mineral is composed of tubular to scalar crystals in parallel stacked aggregates.…”