Crystal Structure of Rutherfordine, UO ₂ CO ₃

A Raman spectroscopic study of the uranyl mineral rutherfordine—revisited

“…However, no structural relation between rutherfordine, blatonite and joliotite was observed. Christ et al [9] showed that the structure consists of sheets of (CO 3 ) 2− groups lying parallel in a plane perpendicular to the b axis, with linear (UO 2 ) 2+ groups inserted into hexagonal holes normal to the sheets. A stacking disorder is present, involving the choice of parallel or antiparallel orientation of (CO 3 ) 2− groups in adjacent sheets.…”

“…A stacking disorder is present, involving the choice of parallel or antiparallel orientation of (CO 3 ) 2− groups in adjacent sheets. [9] Finch et al [5] refined the structure of rutherfordine. They showed that (CO 3 ) 2− groups in alternate layers have the same orientation, not opposite orientations as originally reported by Christ et al [9,10] Topology of uranyl layers arrangement in rutherfordine was discussed by Burns.…”

“…[9] Finch et al [5] refined the structure of rutherfordine. They showed that (CO 3 ) 2− groups in alternate layers have the same orientation, not opposite orientations as originally reported by Christ et al [9,10] Topology of uranyl layers arrangement in rutherfordine was discussed by Burns. [4,11] The infrared spectra of rutherfordine and its synthetic analogues has been published.…”

Some observations on rutherfordine

“…Tb.e data obtained from the ·pattern are given in table 2, together with the ;!-spacings and Miller indices calculated from the results obtained in the previous single crystal study (Christ et al, 1955 Christ et al", 1955-) …”

“…In general it is found :Eor biaxial crystals trre.t two higher indices, close in value, correspond to vibration directions parallel to the layers, while a lower index occurs for the vibration direction normal to the layers~ Such crystals con ... sequently are biaxial negative with moderate to large birefringence~ Examples are aragonite with a-= 1,.530, t3 = 1~681, 7 = 1 .. 686, and KN0 3 with a = 1.335, fi3 = 1.506, and 7 = 1.506 (Bunn, 1946, p. two bonds normal to the plane with U-0 11 (Cromer and Harper, 1955b The values of the six U-0 bond lengths were not determined directly (Christ et al, 1955) but wer:e based on the assumption of an eq,uilateral triangular carbonate ion with C-0 bond lengths of 1.25 A (Brown, Peiser, and Turner-.Jones, 1949). Confirmation of the validity of this assumption follows from the work of Cromer and Harper ( 1955b).…”