The structure of mimetite, arsenian pyromorphite and hedyphane – A Raman spectroscopic study

Frost, Ray L.; Bouzaid, Jocelyne; Palmer, Sara J.

doi:10.1016/j.poly.2007.01.038

Cited by 35 publications

(23 citation statements)

References 16 publications

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“…5 and 6) In the Raman spectra, mimetite is indicated by a strong band corresponding to ν 1 modes of AsO 4 3À at approximately 810 cm À1 ; some influence of ν 3 mode was also discussed . [39] However, in our case, the band was positioned at approx. 820 cm À1 , which is not usual, but it has already been reported, refer to, e.g.…”

Section: Mimetite: Pigment or Alteration Product?contrasting

confidence: 53%

“…The shift of this band may correspond to isomorphic substitutions of As V by P V (in the isostructural series from mimetite to pyromorphite -Pb 5 (PO 4 ) 3 Cl) or to isomorphic substitutions of Pb II by Ca II (as in case of hedyphane -Pb 3 Ca 2 (AsO 4 ) 3 Cl) in the mineral's structure . [39] In the micro-diffraction pattern, the previously mentioned isostructural phases cannot be positively differentiated because of the extent of the overlaps of very closely located diffraction lines. The best fitting, however, was obtained with mimetite.…”

Section: Mimetite: Pigment or Alteration Product?mentioning

confidence: 99%

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Crocoite PbCrO₄ and mimetite Pb₅(AsO₄)₃Cl: rare minerals in highly degraded mediaeval murals in Northern Bohemia

Hradil

Hradilová

Bezdička

et al. 2014

J Raman Spectroscopy

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Mural paintings of exceptional quality, which can be discerned in spite of their extensive mechanical damage and colour fading, have been uncovered in the church of St. Gallus in Kuřívody, Northern Bohemia, dated to the second half of the 13th century. Materials research with particular use of portable X-ray fluorescence, Raman micro-spectroscopy and powder X-ray micro-diffraction revealed the presence of rare pigments. In Kuřívody, it is only a second identification of intentionally used yellow mineral crocoite (PbCrO 4 ) in European art. Its identification is facilitated by providing a very good Raman scattering, even when present in small amounts in fragmentarily preserved colour layers. Light yellow mimetite (Pb 5 (AsO 4 ) 3 Cl) was never before mentioned as intentionally used pigment in Europe. Its finding in Kuřívody, however, corresponds more likely with undesirable physical-chemical conditions causing its formation by alteration of orpiment (As 2 S 3 ) and minium (Pb 3 O 4 ). Obtained results highlight the importance of Raman spectroscopy for direct identification of mineral pigments in low concentrations, which may be crucial for interpreting cultural heritage objects in historical context. By materials, the almost forgotten paintings in Kuřívody can be seen as outstanding and rare example of ancient artistic tradition that has spread to Europe from Mediterranean in early Middle Ages. After all, mineral crocoite was already used by ancient Egyptians to paint sarcophagi and degraded orpiment decorates the walls of the Nefertari's tomb in Thebes.

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Section: Mimetite: Pigment or Alteration Product?contrasting

confidence: 53%

Section: Mimetite: Pigment or Alteration Product?mentioning

confidence: 99%

Crocoite PbCrO₄ and mimetite Pb₅(AsO₄)₃Cl: rare minerals in highly degraded mediaeval murals in Northern Bohemia

Hradil

Hradilová

Bezdička

et al. 2014

J Raman Spectroscopy

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“…The internal vibrations of (PO 4 ) 3 and (AsO 4 ) 3molecules are observed in the range between 290 and 3579.6 cm 1 . Coupling between the ν 1 and ν 3 vibrations as well as between ν 2 and ν 4 vibrations, noted previously on Clpyromorphite and Cl-mimetite spectra[26,[35][36][37][38][39], is also evident for their hydroxyl analogs. A weak band corresponding to the vibrations of (OH)  ions is apparent near the upper limit of the spectra.…”

supporting

confidence: 74%

Arsenate substitution in lead hydroxyl apatites: A Raman spectroscopic study

Giera

Manecki

Bajda

et al. 2016

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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A total of seven compounds of the hydroxylpyromorphite Pb10(PO4)6(OH)2 - hydroxylmimetite Pb10(AsO4)6(OH)2 (HPY-HMI) solid solution series were synthesized at 80°C from aqueous solutions and characterized using Raman spectroscopy. The positions of the bands in all spectra of the series depend on the content of arsenates and phosphates shifting to lower wavenumbers with substitution of (AsO4)(3-) for (PO4)(3-). This shift results from the decreasing bond strength of X-O (where X=P, As) and higher atomic mass of As than P. The position and intensity of major (PO4)(3-) and (AsO4)(3-) bands in Raman spectra exhibit linear correlation with As content, while the ratio of the intensities of these peaks shows exponential correlation. This results due to different polarizability of (PO4)(3-) and (AsO4)(3-) molecules. A small carbonate band develops with increasing As content indicating that hydroxyl lead apatites adopt the (CO3)(2-) ions, particularly at the arsenate end of the series.

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“…[2,50] The small 810 cm −1 peak could have different origins, such as a CrO 2 -4 -based compound or an arsenate. [2,51,52] R1473 ('chalcedony' cup, Venice, 16th century, Figs. 2(d) and 8(a)) Very similar spectra have been recorded on this large cup imitating chalcedony, whatever the spot location, indicating that the multicolored coloration must have been obtained by ion dissolution (with the so-called 'couleurs transparentes' [2] ), not using pigments.…”

Section: R1476 (Polychrome and Gilded Cup Venice ∼1500 Figs 2(b) mentioning

confidence: 99%

Nondestructive on‐site identification of ancient glasses: genuine artefacts, embellished pieces or forgeries?

Ricciardi

Colomban

Tournié

et al. 2008

J Raman Spectroscopy

102

172

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A selection of 23 rare glass objects, mostly enameled, of various provenance and age, from the 5th century BC to the 19th century AD including the Western and Islamic Middle Ages but with a focus on 16th-18th century Venetian and French 'façon de Venise' artefacts, have been studied on-site at the Sèvres museum or at the laboratory. The Raman signatures of the transparent or opacified glass matrix and of enameled decorations are discussed and compared to those previously recorded on ceramics and stained glasses. The Raman parameters allow discrimination between 2 groups (with some variations) of glass bodies, belonging to mixed Ca-Na and Ca-containing Na-rich silicates, with some exceptions. Most enamels are instead lead-based glasses, but we also found enamels having a composition close to that of the glass body. Most of the pigment signatures are similar to those recorded on ceramic glazes, which proves the link between the two technologies. A particular emphasis was given to the identification of white opacification techniques. Very specific signatures could question the authenticity of some artefacts, and at least in two cases, arguments have been found to identify a fake or embellished artefact.

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The structure of mimetite, arsenian pyromorphite and hedyphane – A Raman spectroscopic study

Cited by 35 publications

References 16 publications

Crocoite PbCrO₄ and mimetite Pb₅(AsO₄)₃Cl: rare minerals in highly degraded mediaeval murals in Northern Bohemia

Crocoite PbCrO₄ and mimetite Pb₅(AsO₄)₃Cl: rare minerals in highly degraded mediaeval murals in Northern Bohemia

Arsenate substitution in lead hydroxyl apatites: A Raman spectroscopic study

Nondestructive on‐site identification of ancient glasses: genuine artefacts, embellished pieces or forgeries?

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The structure of mimetite, arsenian pyromorphite and hedyphane – A Raman spectroscopic study

Cited by 35 publications

References 16 publications

Crocoite PbCrO4 and mimetite Pb5(AsO4)3Cl: rare minerals in highly degraded mediaeval murals in Northern Bohemia

Crocoite PbCrO4 and mimetite Pb5(AsO4)3Cl: rare minerals in highly degraded mediaeval murals in Northern Bohemia

Arsenate substitution in lead hydroxyl apatites: A Raman spectroscopic study

Nondestructive on‐site identification of ancient glasses: genuine artefacts, embellished pieces or forgeries?

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Product

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Crocoite PbCrO₄ and mimetite Pb₅(AsO₄)₃Cl: rare minerals in highly degraded mediaeval murals in Northern Bohemia

Crocoite PbCrO₄ and mimetite Pb₅(AsO₄)₃Cl: rare minerals in highly degraded mediaeval murals in Northern Bohemia