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Open AccessFeature PaperArticle

Low-Temperature Crystal Chemistry of Hingganite-(Y), from the Wanni Glacier, Switzerland

1
Institute of Earth Sciences, Saint-Petersburg State University, University Emb. 7/9, 199034 St. Petersburg, Russia
2
ch. des Bruyères 14, CH-1007 Lausanne, Switzerland
3
Geomodel Resource Center, Saint Petersburg State University, Ulyanovskaya str. 1, 198504 St. Petersburg, Russia
4
Center for Optical and Laser Materials Research, Saint Petersburg State University, Ulyanovskaya str. 1, 198504 St. Petersburg, Russia
*
Author to whom correspondence should be addressed.
Minerals 2020, 10(4), 322; https://doi.org/10.3390/min10040322
Received: 10 March 2020 / Revised: 2 April 2020 / Accepted: 2 April 2020 / Published: 4 April 2020
(This article belongs to the Section Crystallography and Physical Chemistry of Minerals)
Hingganite from the Wanni glacier (Switzerland) was studied by means of energy dispersive and wavelength-dispersive spectroscopy, Raman spectroscopy, and low-temperature single-crystal X-ray diffraction. According to its chemical composition, the investigated mineral should be considered as hingganite-(Y). It showed a relatively high content of Gd, Dy, and Er and had limited content of lighter rare-earth element (REE), which is typical for Alpine gadolinite group minerals. The most intense Raman bands were 116, 186, 268, 328, 423, 541, 584, 725, 923, 983, 3383, and 3541 cm−1. Based on data of low-temperature [(−173)–(+7) °C] in situ single-crystal X-ray diffraction, it was shown that the hingganite-(Y) crystal structure was stable in the studied temperature range and no phase transitions occurred. Hingganite-(Y) demonstrated low volumetric thermal expansion (αV = 9(2) × 10−6 °C−1) and had a high thermal expansion anisotropy up to compression along one of the directions in the layer plane. Such behavior is caused by the shear deformations of its monoclinic unit cell. View Full-Text
Keywords: hingganite-(Y); gadolinite-group; thermal expansion; crystal structure; low-temperature; single crystal X-ray diffraction; Raman spectroscopy; Wanni glacier hingganite-(Y); gadolinite-group; thermal expansion; crystal structure; low-temperature; single crystal X-ray diffraction; Raman spectroscopy; Wanni glacier
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MDPI and ACS Style

Gorelova, L.; Vereshchagin, O.; Cuchet, S.; Shilovskikh, V.; Pankin, D. Low-Temperature Crystal Chemistry of Hingganite-(Y), from the Wanni Glacier, Switzerland. Minerals 2020, 10, 322.

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