Cyrilovite from Italy: Structure and crystal chemistry

Cozzupoli, Domenico; Grubessi, O.; Mottana, Annibale; Zanazzi, P. F.

doi:10.1007/bf01163154

Cited by 10 publications

(5 citation statements)

References 9 publications

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“…The crystal structures of natural wardite and of the isomorphous cyrilovite have been solved [12,13]. The structure of cyrilovite was further refined by Cooper et al The cell dimensions are Space Group: P4 1 2 1 2 or P4 3 2 1 2. a = 7.03(1) Å, c = 19.04(1) Å, Z = 4.…”

Section: Introductionmentioning

confidence: 99%

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A vibrational spectroscopic study of the phosphate mineral minyulite KAl2(OH,F)(PO4)2⋅4(H2O) and in comparison with wardite

Frost

López

et al. 2014

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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Vibrational spectroscopy enables subtle details of the molecular structure of minyulite KAl2(OH,F)(PO4)2⋅4(H2O). Single crystals of a pure phase from a Brazilian pegmatite were used. Minyulite belongs to the orthorhombic crystal system. This indicates that it has three axes of unequal length, yet all are perpendicular to each other. The infrared and Raman spectroscopy were applied to compare the structure of minyulite with wardite. The reason for the comparison is that both are Al containing phosphate minerals. The Raman spectrum of minyulite shows an intense band at 1012 cm(-1) assigned to the ν1PO4(3-) symmetric stretching vibrations. A series of low intensity Raman bands at 1047, 1077, 1091 and 1105 cm(-1) are assigned to the ν3PO4(3-) antisymmetric stretching modes. The Raman bands at 1136, 1155, 1176 and 1190 cm(-1) are assigned to AlOH deformation modes. The infrared band at 1014 cm(-1) is ascribed to the PO4(3-) ν1 symmetric stretching vibrational mode. The infrared bands at 1049, 1071, 1091 and 1123 cm(-1) are attributed to the PO4(3-) ν3 antisymmetric stretching vibrations. The infrared bands at 1123, 1146 and 1157 cm(-1) are attributed to AlOH deformation modes. Raman bands at 575, 592, 606 and 628 cm(-1) are assigned to the ν4 out of plane bending modes of the PO4(3-) unit. In the 2600-3800 cm(-1) spectral range, Raman bands for minyulite are found at 3661, 3669 and 3692 cm(-1) are assigned to AlOH/AlF stretching vibrations. Broad infrared bands are also found at 2904, 3105, 3307, 3453 and 3523 cm(-1). Raman bands at 3225, 3324 cm(-1) are assigned to water stretching vibrations. A comparison is made with the vibrational spectra of wardite. Raman spectroscopy complimented with infrared spectroscopy has enabled aspects of the structure of minyulite to be ascertained and compared with that of other phosphate minerals.

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Section: Introductionmentioning

confidence: 99%

“…Within a layer, e.g. around the (0 0 1) plane, two independent pairs of symmetry-correlated AOH groups are arranged in the equatorial pseudo-planes of one kind of MO 6 octahedra [12,13].…”

Section: Introductionmentioning

confidence: 99%

A vibrational spectroscopic study of the phosphate mineral minyulite KAl2(OH,F)(PO4)2⋅4(H2O) and in comparison with wardite

Frost

López

et al. 2014

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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“…Cyrilovite NaFe 3 (OH) 4 (PO 4 ) 2 . 2 H 2 O, 126 which is the Fe-containing final member of the series of minerals belonging to the group of wardite Na(Al,Fe) 3 (OH) 4 (PO 4 ) 2 . 2 H 2 O, is fragmentary present in pegmatites and can occupy cavities of oxidation zones of ferrous precipitates.…”

Section: Synthesismentioning

confidence: 99%

Complex phosphates containing mono- and trivalent cations

Komissarova¹,

Zhizhin²,

Filaretov³

2002

Russ. Chem. Rev.

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“…Crystals of wardite show the lower symmetry by displaying squashed psuedo-octahedrons with striated faces. The crystal structures of natural wardite and of the isomorphous cyrilovite are published [2,6]. The structure of cyrilovite was further refined by Cooper et al [7].…”

Section: Introductionmentioning

confidence: 99%

“…Within a layer, e.g. around the (0 0 1) plane, two independent pairs of symmetry-correlated -OH groups are arranged in the equatorial pseudo-planes of one kind of MO 6 octahedra [2,6]. The mineral is white to colourless, to pale green to blue-green and other colours depending upon the composition of the mineral.…”

Section: Introductionmentioning

confidence: 99%