Serpierite Ca(Cu,Zn)4(OH)6(SO4)2 3H2O - the first occurrence in Romania

Zaharia, Luminița

doi:10.5038/1937-8602.48.1.7

Cited by 4 publications

(4 citation statements)

References 3 publications

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“…Serpierite (Figure S1, spectrum a) was also identified together with brochantite in a sample from Corchia (PR, Northern Italy). The recorded band positions (Table ) are in good agreement with the spectrum presented in RRUFF, and with some published data …”

Section: Resultssupporting

confidence: 90%

“…Antlerite (Cu 3 (SO 4 )(OH) 4 ), brochantite (Cu 4 (SO 4 )(OH) 6 ), posnjakite (Cu 4 (SO 4 )(OH) 6 · H 2 O) and langite (Cu 4 (SO 4 )(OH) 6 · 2H 2 O) are some of the most interesting basic copper sulphates from those points of view. Others are chalcantite (CuSO 4 · 5H 2 O), [66] serpierite (Ca(Cu,Zn) 4 (OH) 6 (SO 4 ) 2 · 3H 2 O), [81,82] connellite (Cu 36 (SO 4 ) (OH) 62 Cl 8 · 6H 2 O) [58,83] and chalcophyllite (Cu 18 Al 2 (AsO 4 ) 4 (SO 4 ) 3 (OH) 24 · 36H 2 O). [84] Brochantite and antlerite seem to be more stable than the other sulphates.…”

Section: Sulphatesmentioning

confidence: 99%

“…The recorded band positions (Table 3) are in good agreement with the spectrum presented in RRUFF, [64] and with some published data. [81,82] Pyromorphite (Pb 5 (PO 4 ) 3 Cl) was also identified in some light yellowish green crystals occurring together with brochantite in one sample. The recorded spectrum corresponds to published data [64,85] as regards the region 1120-150 cm À1 (see Table 3).…”

Section: Sulphatesmentioning

confidence: 99%

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Raman spectroscopy of green minerals and reaction products with an application in Cultural Heritage research

Coccato

Bersani

Coudray

et al. 2016

J Raman Spectroscopy

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Raman spectroscopy is a powerful technique for the characterization of materials and is of valuable use in archaeometrical research in general. Green compounds of natural or synthetic origin are found in many research areas, ranging from mineralogy, to pigment identification, to corrosion studies. However, a detailed and comprehensive database of spectra and references is still missing in the literature. This paper provides both, a literature review and downloadable Raman spectra of reference products, to the researcher dealing with green materials in cultural heritage. Moreover, it tackles nomenclature issues. The collected spectra are discussed in relation to the preliminary/commercial identification of the material itself and to the published data. Practical aspects regarding the laser wavelength selection are also discussed with regards to the comparison to published reference spectra. The range of studied green materials is wide and encompasses Cu containing compounds (natural and synthetic, more or less known as pigments or degradation products, including polymorphs of the same formula), Fe based (green earths and synthetic organic pigments), modern Cr and Co green pigments. This approach is illustrated by analysing a cross section of a green zone of the Early Netherlandish panel painting ‘Ghent Altarpiece’ by the Van Eyck brothers. Copyright © 2016 John Wiley & Sons, Ltd.

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Section: Resultssupporting

confidence: 90%

Section: Sulphatesmentioning

confidence: 99%

Section: Sulphatesmentioning

confidence: 99%

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Raman spectroscopy of green minerals and reaction products with an application in Cultural Heritage research

Coccato

Bersani

Coudray

et al. 2016

J Raman Spectroscopy

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“…0.004 0.014 0.000 0.000 0.011 0.027 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 P 0.020 0.018 0.021 0.024 0.019 0.026 0.018 0.018 0.019 0.019 0.023 0.017 0.020 0.024 0.017 S 1.976 1.968 1.979 1.976 1.969 1.947 1.982 1.982 1.981 1.981 1.977 1.983 1.980 1.976 1.983 Σ 2.000 2.000 2.000 2.000 2.000 2.000 2.000 2.000 2.000 2.000 2.000 2.000 2.000 2.000 2.000 OH 5.969 5.771 5.865 5.845 5.858 5.824 5.904 5.915 5.985 6.021 6.093 6.101 6.101 6.123 6.161 Obr. 11 Graf závislosti obsahů Cu a Zn v serpieritu ze Zlatých Hor a jejich srovnání s publikovanými údaji (Faraone et al 1967;Sabelli, Zanazzi 1968;Krause, Täubner 1992;Zaharia 2003;Pauliš et al 2005 Brochantit je ve studovaném materiálu velmi hojný, vytváří jasně zelené nesouvislé krystalické povlaky na ploše až 2×2 cm (obr. 12), v asociaci s olivově zeleným ktenasitem pak i skupiny tmavě zelených až černozelených krystalů o velikosti do 0.2 mm.…”

Section: Metodika Výzkumuunclassified

Ktenasit a jeho minerální asociace z ložiska Zlaté Hory - východ (Česká republika)

Sejkora,

Pauliš,

Bureš

et al. 2023

Bull Mineral Petrolog

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The rare Cu-Zn sulphate, ktenasite, was found in the association with schulenbergite, serpierite, gypsum and brochantite at abandoned stope of the Modrá štola adit, the ore deposit Zlaté Hory - East, Czech Republic. Ktenasite occurs there as two different (color, morphology) types, the first is olive green to dark green columnar crystals up to 4 mm in length which forms radially arranged groups or rich crystalline coatings. The second type is represented by blue to greenish blue crystalline coatings or hemispherical or fan-shaped aggregates formed by thin tabular crystals. The X-ray powder diffraction data, Raman spectra and chemical composition of both types are almost identical. Ktenasite is monoclinic, space group P21/c, the unit-cell parameters refined from X-ray powder diffraction data are: a 5.610(2), b 6.123(2), c 23.827(9) Å, β 95.27(3)o and V 815.0(4) Å3. Its chemical analyses correspond to the empirical formula Zn1.00(Cu3.13Zn0.96Mg0.07Al0.01)Σ4.17(SO4)1.98(PO4)0.01(SiO4)0.01(OH)6.32·6H2O. Schulenbergite most often occurs only as an admixture in blue-green crystalline aggregates of ktenasite, sometimes together with serpierite. More rarely, its blue tabular crystals with a pearly luster up to 0.4 mm in size were also observed. Schulenbergite is trigonal, space group R-3, the unit-cell parameters refined from X-ray powder diffraction data are: a 8.187(3), c 7.012(4) Å and V 410.5(3) Å3. Its chemical analyses correspond to the empirical formula (Cu4.96Zn2.34)7.30(SO4)1.92(SiO4)0.05(PO4)0.02 (OH)10.47·6H2O. Serpierite is relatively abundant in the studied mineral association, usually forms light blue fine crystalline coatings, its fan-shaped aggregates up to 4 mm in size formed by elongated tabular crystals have also been found more rarely. Its chemical analyses correspond to the empirical formula (Ca1.14Mn0.03Mg0.02)Σ1.19(Cu3.08Zn0.73)Σ3.81(SO4)1.99 (PO4)0.02(OH)5.97·3H2O. Abundant brochantite forms bright green crystalline coatings and tiny dark green to black-green crystals. Its chemical analyses correspond to the empirical formula (Cu3.80Zn0.17Al0.02)Σ3.99(SO4)0.99(PO4)0.01(OH)6.00. The origin of studied mineral association is connected with sub-recent weathering of primary sulphides (pyrite, pyrrhotite, sphalerite and chalcopyrite) in the conditions of abandoned mine space.

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