ICP, IR, Raman, NMR investigations of beryls from pegmatites of the Sudety Mts

Łodziński, M.; Sitarz, Maciej; Stec, K.; Kozanecki, Marcin; Fojud, Z.; Jurga, Stefan

doi:10.1016/j.molstruc.2004.12.042

Cited by 51 publications

(52 citation statements)

References 17 publications

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“…Eskişehir beryl contains high Na 2 O (1.69%) compared to K 2 O (<0.29%) and indicates alkali-rich, sodic beryl (Łodziński et al, 2005). The presence of type-II H 2 O molecules narrow 3594 cm -1 and strong 1634 cm -1 bands corresponds to the presence of alkalis in the structural channels of beryl, similar to that described for beryls of the Sudety Mountains and Macedonian regions (Łodziński et al, 2005;Makreski and Jovanovski, 2009). These stretching bands decrease, and type-II H 2 O disappears when the alkali content of the beryl falls (Manier-Glavinaz et al, 1989).…”

Section: Discussionsupporting

confidence: 76%

“…Bands at 3594, 1634 and 1602 cm -1 correspond to the characteristic stretching vibrations of OH and H2O molecules in the channel coordinated to Be 2+ cations in tetrahedral coordination and Al 3+ cations in octahedral coordination along the c-axis direction of the beryl crystal (Łodziński et al, 2005;Makreski and Jovanovski, 2009) (Fig. 5).…”

Section: Infrared Spectramentioning

confidence: 99%

“…5). 1184, 1144, 952, 749, 519 and 441 cm -1 bands are characteristic of the Si-O stretching vibration (Farmer, 1974;Łodziński et al, 2005). Bands at 808, 749, 680 and 650 cm -1 correspond to Be-O stretching, and bands at 519 and 492 cm -1 correspond to Al-O vibrations (Hofmeister et al, 1987;Viana et al, 2002;Łodziński et al, 2005;Makreski and Jovanovski, 2009).…”

Section: Infrared Spectramentioning

confidence: 99%

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Occurrence of Cr-bearing beryl in stream sediment from Eskişehir, NW Turkey

Erkoyun

Kadır

2016

Earth sci. res. j.

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Beryl crystals are found within stream sediments transecting schists in the northeast of Eskişehir, western Anatolia. This paper studied the Eskişehir beryl crystals with optical microscopy, scanning electron microscopy (SEM-EDX), infrared spectroscopy (IR) and geochemical analyses. Beryl is accompanied by garnet, glaucophane, quartz, epidote, muscovite and chlorite in the stream sediments. The crystals are euhedral emerald (green gem beryl) and light bluishgreen aquamarine, with ideal sharp IR bands. Wet chemical analysis of Eskişehir beryl yielded 61.28% SiO2, 15.13% Al2O3, 12.34% BeO, 0.18% Cr2O3, 1.49% MgO, 1.69% Na2O, 0.98% Fe2O3, and 0.008% V2O3, resulting in the formula (Al1.75Cr0.01Mg0.22Fe0.08)(Be2.90Si6.00)(Na0.32)O18. Large Ion Lithophile Elements (LILE) (barium, strontium), some transition metals (cobalt, except nickel) and High Field Strength Elements (HFSE) (niobium, zirconium, and yttrium) in stream sediments that are associated with beryl exhibited low content about metamorphic rocks. Beryl formation appears to be controlled by upthrust faults and fractures that juxtaposed them with Cr-bearing ophiolitic units and a regime of metasomatic reactions. Such beryl crystals have also been found in detrital sediments that are derived from the schists.Cristales de berilio fueron encontrados en sedimentos de corrientes que atraviesan en esquistos en el noreste de Eskisehir, al oeste de Anatolia. En este artículo se presentan resultados sobre el estudio de los cristales de berilio de Eskisehir con microscopio electrónico de barrido (SEM-EDX, del inglés Scanning Electron Microscopy), espectroscopia infrarroja y análisis geoquímicos. El berilio estaba acompañado de granate, glaucofana, cuarzo, epidota, moscovita, y clorito en las corrientes sedmientarias. Los cristales son esmeraldas de formas definidas (gema verde de berilio) y aguamarinas color verde celeste, con bandas de espectroscopia infrarroja de buena nitidez. El análisis químico húmedo del berilio de Eskisehir mostró 61.28 % de SiO2, 15.13 % de Al2O3, 12.34 % de BeO, 0.18 % de Cr2O3, 1.49 % de MgO, 1.69 % de Na2O, 0.98 % de Fe2O3, y 0.008% de V2O3, lo que resulta en la formula (Al1.75Cr0.01Mg0.22Fe0.08)(Be2.90Si6.00)(Na0.32)O18. Los elementos litófilos de ion grande (bario, estroncio), algunos metales de transición (cobalto, excepto níquel) y los elementos de gran campo de fuerza (niobio, circonio e itrio) en las corrientes de sedimentos que están con berilio mostraron un bajo contenido sobre las rocas metamórficas. Las formaciones de berilio aparecen controladas por fallas de cabalgamiento y fracturas que se yuxtaponen con las unidades ofiolíticas relacionadas con cromo y un régimen de reacciones metasomáticas. Estos cristales de berilio se han encontrado también en sedimentos detríticos que se derivan de los esquistos. EARTH SCIENCES

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Section: Discussionsupporting

confidence: 76%

Section: Infrared Spectramentioning

confidence: 99%

Section: Infrared Spectramentioning

confidence: 99%

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Occurrence of Cr-bearing beryl in stream sediment from Eskişehir, NW Turkey

Erkoyun

Kadır

2016

Earth sci. res. j.

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“…As it is well‐known, ionic substitutions generally occur in beryl lattice sites: The most common are Li + for Be 2+ ; Mg 2+ , Fe 2+ , Fe 3+ , Mn 2+ , Cr 3+ , V 3+ , and Ti 4+ for Al 3+ ; and Be 2+ or Al 3+ for Si 4+ …”

Section: Introductionmentioning

confidence: 99%

“…Beryl (Be 3 Al 2 Si 6 O 18 ) has a structure consisting of ring silicate with a hexagonal structure arranged in parallel layers forming channels parallel to the c ‐axis. These layers are linked together by Al 3+ ions located in octahedral coordination and Be 2+ ions—in tetrahedral coordination …”

Section: Introductionmentioning

confidence: 99%

Combining Fourier transform infrared and Raman spectroscopies with Gaussian deconvolution: An improved approach for the characterization of emeralds

Branca

Arcovito

Interdonato

et al. 2019

J Raman Spectroscopy

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In the present work, five natural emeralds from various localities and one hydrothermal synthetic emerald were investigated by scanning electron microscopy–energy‐dispersive X‐ray technique (SEM–EDX), Raman and Fourier transform infrared (FTIR) attenuated total reflection spectroscopy. A two‐step procedure was used for this study. In the first step, the samples were analyzed by SEM–EDX to evidence differences in the chemical composition and, in particular, to estimate their different alkali contents. In the second step, a detailed vibrational analysis was made, paying a special attention to three specific vibrational bands generally related to the content of alkalis: the infrared OH (3,800–3,400 cm−1) and Si─O (1,000–1,300 cm−1) stretching bands and the Raman band around 1,066 cm−1. In particular, in order to resolve overlapped bands present in these latter two ranges, a peak finding was done by curve fitting with Gaussian functions following a minimizing procedure. This analysis was accomplished by the second and fourth derivative of the FTIR and Raman spectra. These processing procedures allowed us to capture unambiguously spectral vibrational differences related to differences in the chemical composition of the investigated emeralds and, in particular, to their alkali content.

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