Micro-Raman spectra of ugrandite garnet

Мороз, Т. Н.; Ragozin, A. L.; Salikhov, D. N.; Belikova, G. I.; Пучков, В. Н.; Kagi, Hiroyuki

doi:10.1016/j.saa.2008.10.024

Cited by 8 publications

(6 citation statements)

References 12 publications

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“…). These bands are characteristic of Ca garnets (also known as ugrandite garnets), and the bands are shifted compared with Al garnets, but they are caused in general because of the same vibrations cited previously . Semi‐quantitative calculations of the approximate composition of the garnets have shown that they are both grossular garnets (CN1S6, 90% with a deviation of 0.43, and FN1S2, 96% with a deviation of 0.64) .…”

Section: Resultsmentioning

confidence: 65%

Micro‐Raman spectroscopy on two chalices from the Benedictine Abbey of Einsiedeln: Identification of gemstones

Karampelas¹,

Wörle

Hunger

et al. 2012

J Raman Spectroscopy

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The gems that adorn two golden chalices from Einsiedeln Abbey (Switzerland) crafted in 1609 and 1629 were investigated using Raman spectroscopy. The results were also compared with those obtained by other non-destructive means such as microscopy and energy-dispersive X-ray fluorescence. The chalice made in 1609 was adorned with 16 corundum (15 rubies and 1 sapphire), four garnets (two almandine and two grossular), seven quartzes (six amethysts and one citrine) and one peridot (forsterite olivine). All pearls of this chalice were found to be from a saltwater mollusc. The chalice crafted in 1629 was adorned with 23 diamonds. Compilation of all the results does not exclude that the stones mounted to the chalices are of 'oriental' origin. However, more research needs to be done by additional spectroscopic means to shed more light on their origin.

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Section: Resultsmentioning

confidence: 65%

Micro‐Raman spectroscopy on two chalices from the Benedictine Abbey of Einsiedeln: Identification of gemstones

Karampelas¹,

Wörle

Hunger

et al. 2012

J Raman Spectroscopy

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“…The cubic garnet, X 3 2+ Y 2 3+ Si 3 O 12 , structure ( Ia

\overset{3}{true}

d (230) = O h 10 ) consists of a three‐dimensional network of alternate corner‐linked SiO 4 tetrahedra and YO 6 octahedra (Y = Cr 3+ , Fe 3+ , Al 3+ ) with divalent cations (X = Mg 2+ , Fe 2+ , Ca 2+ , Mn 2+ ) in dodecahedrally coordinated interstices. [ 47–56 ] Symmetry analysis of garnets shows that there are 240 vibrations, which can be classified into the following 25 Raman active and 17 IR active modes:

{3A}_{1g} ((), Raman) + {5A}_{2g} + {8E}_{g} ((), Raman) + 14 F_{1g} + 14 F_{2g} ((), Raman) + {5A}_{1u} + {5A}_{2u} + 10 E_{u} + 17 F_{1u} ((), IR) + 16 F_{2u} .

…”

Section: Resultsmentioning

confidence: 99%

“…An anomalous birefringence in ugrandite garnets reduces the symmetry to the orthorombic Fddd (70) = D 2h 24 or even to the triclinic C i space group. [ 55,56 ] These space groups do not have another sp. gr.…”

Section: Resultsmentioning

confidence: 99%

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The use of Raman and infrared spectroscopy in determining the space symmetry group among the groups with the same rules of systematic absence in the diffraction patterns: Some basic principles and applications

Мороз

Edwards

2021

J Raman Spectroscopy

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Raman spectroscopy and infrared (IR) spectroscopy can be used in the determination of the structural organization of crystals from the short-range order (IR) to the mid-and far-range orders (Raman). Among the 230 possible crystal space groups, only 61 can unambiguously be determined by X-ray diffraction. In other cases, from two to five space groups are characterized by unified diffraction extinction rules. The symmetry of the active irreducible representations of vibrations in IR, Raman, and hyper-Raman (HR) spectra for all crystallographic systems are systematized, and cases are indicated where the ambiguity in the assignment of crystal structures to the space groups with unified diffraction extinction rules can be overcome. The refinement of a space group of a mineral by analyzing the selection rules from IR and Raman spectra is discussed, and some examples are considered, including nontronite, kladnoite, and ugrandite.

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“…Granitoyidlerde ana ve tali mineral olarak yer alabilen mineral grupları ve bunların Raman spektroskopileri üzerine yapılan çalışmalardan en önemlileri şunlardır: Granatların Raman spektroskopisini Hofmeister ve Chopelas[38], Mingsheng ve diğ [39],. Kolesov ve Geiger[40], Moroz ve diğ [41],. Bersani ve diğ [42]…”

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Raman Spektroskopisinin İlkeleri ve Mineral Tanımlamalarında Kullanılması

Akçe

Kadıoğlu

2020

Nevşehir Bilim Ve Teknoloji Dergisi

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Minerallerin ayrıntılı olarak adlandırmaları ve tanımlamaları ince kesit üzerinde polarizan mikroskop yardımı ile ve toz hale getirilerek X-Işını Kırınımı (XRD) yöntemi ile yapılabilmektedir. Her iki yöntemde mineraller üzerinde tahribat yapılmakta ve ciddi bir bilgi birikimi ve deneyim gerektirmektedir. Raman spektroskopisinde örnek üzerinde herhangi bir tahribat yapmadan, mineral üzerine gönderilerek molekül ile etkileşime giren ışığın dalga boyuna göre saçılan ışığın dalga boyundaki farklar sonucu oluşan spektrumlar, mineralin kimliğini yansıtabilmektedir. Her mineralin moleküler bileşim farklılığından oluşan spektrumlar yardımıyla mineral içerisindeki değişimler ölçülebilmektedir. Böylece mineral adlandırmanın yanında taze ve bozunmuş mineral farklılıkları da bu yöntem ile ayırt edilmektedir. Bu çalışmada Raman spektroskopi yöntemini kullanarak plajiyoklaz, ortoklaz, anortoklaz, biyotit, filogopit ve granat minerallerinin Raman spektroskopik tanımlanmaları yapılmış ve oluştukları kayanın kökeni hakkında yorumlar yapılmıştır. Böylece minerallerin tahribatsız analiz yöntemi ile türlerinin tespiti örneklerle ortaya konulmuştur.

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Micro-Raman spectra of ugrandite garnet

Cited by 8 publications

References 12 publications

Micro‐Raman spectroscopy on two chalices from the Benedictine Abbey of Einsiedeln: Identification of gemstones

Micro‐Raman spectroscopy on two chalices from the Benedictine Abbey of Einsiedeln: Identification of gemstones

The use of Raman and infrared spectroscopy in determining the space symmetry group among the groups with the same rules of systematic absence in the diffraction patterns: Some basic principles and applications

Raman Spektroskopisinin İlkeleri ve Mineral Tanımlamalarında Kullanılması

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