Ceruleite: infrared spectroscopy and a new locality in Cornwall

Braithwaite, R. S. W.

doi:10.1180/minmag.1987.051.363.16

Cited by 1 publication

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“…The mineral appears to be sky-blue to a pale blue in colour. The mineral is triclinic with space group 1 bar [4,6,7] ). An infrared spectrum of ceruleite has been published [6].…”

Section: Introductionmentioning

confidence: 99%

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Infrared and Raman spectroscopic characterization of the arsenate mineral ceruleite Cu2Al7(AsO4)4(OH)13⋅11.5(H2O)

Frost¹,

Lópes²,

Scholz³

et al. 2013

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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The molecular structure of the arsenate mineral ceruleite has been assessed using a combination of Raman and infrared spectroscopy. The most intense band observed at 903 cm(-1) is assigned to the (AsO4)(3-) symmetric stretching vibrational mode. The infrared spectrum shows intense bands at 787, 827 and 886 cm(-1), ascribed to the triply degenerate ν3 antisymmetric stretching vibration. Raman bands observed at 373, 400, 417 and 430 cm(-1) are attributed to the ν2 vibrational mode. Three broad bands for ceruleite found at 3056, 3198 and 3384 cm(-1) are assigned to water OH stretching bands. By using a Libowitzky empirical equation, hydrogen bond distances of 2.65 and 2.75Å are calculated. Vibrational spectra enable the molecular structure of the ceruleite mineral to be determined and whilst similarities exist in the spectral patterns with the roselite mineral group, sufficient differences exist to be able to determine the identification of the minerals.

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“…The mineral appears to be sky-blue to a pale blue in colour. The mineral is triclinic with space group 1 bar [4,6,7] ). An infrared spectrum of ceruleite has been published [6].…”

Section: Introductionmentioning

confidence: 99%

“…The mineral is triclinic with space group 1 bar [4,6,7] ). An infrared spectrum of ceruleite has been published [6]. This work has shown that the water is coordinated to the arsenate anion in the ceruleite structure.…”

Section: Introductionmentioning

confidence: 99%