Characterization of Gadolinite-Group Minerals Using Crystallographic Data Only: The Case of Hingganite-(Y) From Cuasso Al Monte, Italy

Demartin, Francesco; Minaglia, Alessandro; Gramaccioli, C. M.

doi:10.2113/gscanmin.39.4.1105

Cited by 30 publications

(41 citation statements)

References 11 publications

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“…The mineral replaces gadolinite-(Ce) (Figure 12a). Chemical composition of hingganite-(Ce) from this locality (Table 13) is similar to those from other occurrences [85,91], with the difference of higher CaO values (up to 4.4 wt %). The mineral has not been confirmed by X-ray studies.…”

Section: Gadolinite-(y) Y 2 Fe 2+ Be 2 O 2 (Sio 4 )supporting

confidence: 68%

Beryllium Mineralogy of the Kola Peninsula, Russia—A Review

Lyalina¹,

Selivanova²,

Zozulya³

et al. 2018

Minerals

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This paper reviews the available information on the beryllium mineralogy of the different type of occurrences in the Kola Peninsula, northwest Russia. Beryllium mineralization in the region is mainly associated with alkaline and felsic rocks, which differ significantly in petrological, geochemical, mineralogical features and age. In total 28 beryllium minerals are established on the Kola Peninsula up today. Beryl is one of the ore minerals in the differentiated granite pegmatites of the Kolmozerskoe lithium deposit. A large diversity of beryllium minerals occur in the pegmatites and hydrothermal veins formed in the late stages of the Lovozero and Khibiny alkaline massifs. Most of these minerals, as leifite, lovdarite, odintsovite, sphaerobertrandite and tugtupite are rare in other environments and have unique properties. These minerals formed under conditions of extreme alkalinity and their formation was favored by abrupt changes in the alkalinity regimes. Some of minerals, as chrysoberyl in xenoliths of hornfels, genthelvite and unique intergrowth of meliphanite and leucophanite formed in contrasting geochemical fronts between felsic/intermediate and mafic rocks.

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Section: Gadolinite-(y) Y 2 Fe 2+ Be 2 O 2 (Sio 4 )supporting

confidence: 68%

Beryllium Mineralogy of the Kola Peninsula, Russia—A Review

Lyalina¹,

Selivanova²,

Zozulya³

et al. 2018

Minerals

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“…The M site is commonly occupied by Fe 2þ as in gadolinites (e.g. Miyawaki et al, 1984;Demartin et al, 2001;Cámara et al, 2008) and homilite (Miyawaki et al, 1985), although other divalent cations with ionic radius close to Fe 2þ (Mg, Mn, Co, Ni, Cu and Zn À Ito & Hafner, 1974;Ni À Foit & Gibbs, 1975) can also enter the site. Nevertheless, the M site might also host large divalent cations like Ca in minasgeraisite-(Y), although the local strain requires relaxation and lowering of symmetry (Atencio, unpublished data).…”

Section: The M Sitementioning

confidence: 99%

“…However, the incorporation of Li in the QO 4 tetrahedron implies that part of the iron might be in the trivalent state . On the other hand, the M site is commonly vacant as, e.g., in datolite and hingganite (e.g., Foit et al, 1973;Demartin et al, 2001;Miyawaki et al, 2007;Pr sek et al, 2010;Majka et al, 2011); the charge is balanced by protonation of two oxygens at the '5 anion sites. Both protons are located inside the empty M site due to steric hindrance requirements À to avoid repulsion with nearby cations.…”

Section: The M Sitementioning

confidence: 99%

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Nomenclature of the gadolinite supergroup

Bačík¹,

Miyawaki²,

Atencio³

et al. 2017

ejm

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The newly defined gadolinite supergroup approved by the IMA CNMNC (vote 16-A) includes mineral species that have the general chemical formula A 2 MQ 2 T 2 O 8 ' 2 and belong to silicates, phosphates and arsenates. Each site is occupied by: A À Ca, REE (Y and lanthanoids), actinoids, Pb, Mn 2þ , Bi; M À Fe, □ (vacancy), Mg, Mn, Zn, Cu, Al; Q À B, Be, Li; T À Si, P, As, B, Be, S; and ' À O, OH, F. The classification of the gadolinite supergroup is based on the occupancy of A, M, Q, T and ' sites and application of the dominant-valency and dominant-constituent rules. The gadolinite supergroup is divided into two groups defined by prevailing charge occupancy at the T site À Si 4þ in gadolinite group and P 5þ or As 5þ in herderite group. The gadolinite group is divided into the gadolinite and datolite subgroups. The A site is dominantly occupied by divalent cations in the datolite subgroup and by trivalent cations in the gadolinite subgroup. Accordingly, the Q site is dominantly occupied by B 3þ in the datolite subgroup and by Be 2þ in the gadolinite subgroup. The herderite group is divided into two subgroups. The herderite subgroup is defined by the dominant divalent cation (usually Ca 2þ ) in the A site and Be 2þ in the Q site, while the M site is vacant. The drugmanite subgroup is defined by the dominance of divalent cations (usually Pb 2þ ) in the A site, vacancy in the Q site and the occupation of the M site. Moreover, "bakerite" is discredited as mineral species because it does not meet the conditions of the dominant-constituent rule.

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“…The crystal structure of hingganite-(Y), Y 2 Be 2 Si 2 O 8 (OH) 2 , at ambient conditions was firstly solved and refined by Yakubovich et al [9] by analogy with datolite and gadolinite and later refined by Demartin et al [33] and Miyawaki et al [11]. Previously, we studied the high pressure behavior of hingganite-(Y) [34], but no phase transitions up to 50 GPa were detected.…”

Section: Introductionmentioning

confidence: 99%

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

Gorelova

Vereshchagin

Cuchet³

et al. 2020

Minerals

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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.

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Characterization of Gadolinite-Group Minerals Using Crystallographic Data Only: The Case of Hingganite-(Y) From Cuasso Al Monte, Italy

Cited by 30 publications

References 11 publications

Beryllium Mineralogy of the Kola Peninsula, Russia—A Review

Beryllium Mineralogy of the Kola Peninsula, Russia—A Review

Nomenclature of the gadolinite supergroup

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

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