Donathite discredited: a mixture of two spinels

Burns, Peter C.; Hawthorne, Frank C.; Libowitzky, Eugen; Bordes, N.; Ewing, R.C.

doi:10.1127/njmm/1997/1997/163

Cited by 38 publications

(47 citation statements)

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“…However, such infrared bands near 900 cm 1 were observed in some synthetic ammonium (900 cm 1 , 1.785Å), potassium (892 cm 1 , 1.790Å; or 880 cm 1 , 1.799Å) and strontium uranyl selenites (909 cm 1 , 1.778Å, X-ray an average 1.821Å). 11,16 The molar ratio Sr : U : Se D 1 : 3 : 2 in the formula of the strontium uranyl selenite hydrate, prepared by Almond and Albrecht-Schmitt, 11 31,32 and Burns 33 and also with uranyl selenite minerals with similar uranyl anion sheet phosphuranylite-type topology, as guilleminite and marthozite. Bands close to 850-860 cm 1 may be also attributed to the 1 UO 2 2C (866.5 cm 1 , 1.747Å; 856.4 cm 1 , 1.756Å).…”

Section: Resultsmentioning

confidence: 99%

A Raman spectroscopic study of the uranyl selenite mineral haynesite

Frost

Weier

Reddy

et al. 2006

J. Raman Spectrosc.

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The mineral haynesite, a uranyl selenite, has been characterised by Raman spectroscopy at 298 and 77 K. Two bands at 811.5 and 800.2 cm −1 are assigned to the symmetric stretching modes of the (UO 2 / 2+ and (SeO 3 / 2− units respectively. These values give calculated U-O bond lengths of 1.799 and/or 1.801Å. The broad band at 861.8 cm −1 is assigned to the n 3 antisymmetric stretching mode of the (UO 2 / 2+ (calculated U-O bond length 1.813Å). Additional bands are observed in the 77 K spectrum. In the spectroscopy of selenite compounds, the position of the antisymmetric stretching vibration occurs at lower wavenumbers than the symmetric stretching mode and thus the band at 740.5 cm −1 is attributed to the n 3 antisymmetric stretching vibration of the (SeO 3 / 2− units. The n 4 and the n 2 vibrational modes of the (SeO 3 / 2− units are observed at 418.5 and 472.1 cm −1 . Bands observed at 278.3, 257.3 and 218.8 cm −1 are assigned to OUO bending vibrations.

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Section: Resultsmentioning

confidence: 99%

A Raman spectroscopic study of the uranyl selenite mineral haynesite

Frost

Weier

Reddy

et al. 2006

J. Raman Spectrosc.

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“…On the other hand, the U-O bond lengths in uranyls calculated in this paper using the wavenumbers of the UO 2 2C stretching vibrations are in agreement with Burns's conclusions. 28 Two bands close to 980 and 995 cm 1 are attributed to the 1 PO 4 3 symmetric stretching vibrations. In the case of the Shino sample, at 77 K only one band at 997 cm 1 was observed.…”

Section: Resultsmentioning

confidence: 99%

Raman spectroscopic study of the uranyl phosphate mineral dewindtite

Frost

Čejka

Weier

et al. 2006

J Raman Spectroscopy

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Raman spectra of two samples of the uranyl mineral dewindtite are presented and interpreted. The observed bands are attributed to the stretching and bending vibrations of the (UO 2 ) 2+ and (PO 4 ) 3− units and water molecules. The hydrogen-bonding network in the dewindtite crystal structure is briefly mentioned. The U-O bond lengths in uranyls were calculated with empirical relations and wavenumbers of the (UO 2 ) 2+ stretching vibrations. These calculations are in agreement with the X-ray single crystal structure data.

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“…9 According to Hawthorne 14 -16 from the general point of view, and the conclusions by Burns concerning uranium minerals, hydrogen bonding is of fundamental importance to the stability of the structure of minerals. Burns 7 and Burns et al 8,17 also proposed hydrogen-bonding network in the crystal structures on the basis of crystal-chemical and bondvalence parameter arguments. This may also be applied to walpurgite.…”

Section: Resultsmentioning

confidence: 99%