litosphereЛитосфераLITHOSPHERE (Russia)1681-90042500-302XA.N. Zavaritsky Institute of Geology and Geochemistry10.24930/1681-9004-2024-24-2-264-283litosphere-2060Research ArticleСтатьиArticlesУточнение кристаллической структуры кристофшеферита-(Ce) и особенности модулярного строения полисоматической серии чевкинита {A4B(T2O7)2}{C2D2O8}m (m = 1, 2)Refinement of the crystal structure of christofschäferite-(Ce) and the modular aspect of the chevkinite polysomatic series with the general formula of {A4B(T2O7)2}{C2D2O8}m (m = 1, 2)АксеновС. М.AksenovS. M.

184209, г. Апатиты, ул. Ферсмана, 14

123182, г. Москва, пл. Академика Курчатова, 1

Sergey M. Aksenov

14 Fersman st., 184209 Apatity

1 Academician Kurchatov pl., 123182 Mosсow

ks.crys@gmail.comЗарубинаЕ. С.ZarubinaE. S.

184209, г. Апатиты, ул. Ферсмана, 14

Ekaterina S. Zarubina

14 Fersman st., 184209 Apatity

РасцветаеваР. К.RastsvetaevaR. K.

123182, г. Москва, пл. Академика Курчатова, 1

Ramiza K. Rastsvetaeva

1 Academician Kurchatov pl., 123182 Mosсow

ЧукановН. В.ChukanovN. V.

142432, г. Черноголовка, пр. Академика Семенова, 1

Nikita V. Chukanov

1 Academician Semenov av., 142432 Chernogolovka

ФилинаМ. И.FilinaM. I.

119991, г. Москва, ул. Косыгина, 19

Maria I. Filina

19 Kosygin st., 119991 Moscow

Геологический институт, обособленное подразделение Федерального государственного бюджетного учреждения науки Федерального исследовательского центра “Кольский научный центр Российской академии наук” (ГИ КНЦ РАН); НИЦ Курчатовский институтРоссияGeological Institute, Separate subdivision of the Federal State Budgetary Institution of Science of the Federal Research Center “Kola Science Center” (GI KSC RAS); NRC Kurchatov InstituteRussian FederationГеологический институт, обособленное подразделение Федерального государственного бюджетного учреждения науки Федерального исследовательского центра “Кольский научный центр Российской академии наук” (ГИ КНЦ РАН)РоссияGeological Institute, Separate subdivision of the Federal State Budgetary Institution of Science of the Federal Research Center “Kola Science Center” (GI KSC RAS)Russian FederationНИЦ Курчатовский институтРоссияNRC Kurchatov InstituteRussian FederationФИЦ Проблем химической физики и медицинской химии РАНРоссияFederal Research Center of Problems of Chemical Physics and Medicinal Chemistry, RASRussian FederationИнститут геохимии и аналитической химии им. В.И. Вернадского РАНРоссияV.I. Vernadsky Institute of Geochemistry and Analytical Chemistry, RASRussian Federation202403052024242264283Copyright © Аксенов С.М., Зарубина Е.С., Расцветаева Р.К., Чуканов Н.В., Филина М.И., 20242024Аксенов С.М., Зарубина Е.С., Расцветаева Р.К., Чуканов Н.В., Филина М.И.Aksenov S.M., Zarubina E.S., Rastsvetaeva R.K., Chukanov N.V., Filina M.I.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://www.lithosphere.ru/jour/article/view/2060

Объект исследования. Кристаллическая структура кристофшеферита-(Ce) первоначально была уточнена в рамках низкосимметричной пространственной группы P21/m, которая позволила установить локальные особенности распределения с высокой степенью детализации. В данной работе выполнено повторное уточнение кристаллической структуры кристофшеферита-(Ce) в рамках высокосимметричной пространственной группы P21/a с использованием полученного ранее массива дифракционных данных, а также проведен топологический и симметрийный анализ (в рамках OD-теории) представителей группы чевкинита с общей формулой A4BC2D2(Si2O7)2O8. Материал и методы. Кристофшеферит-(Ce) найден в эруптивном обломке магматической породы, который был отобран из продуктов вулканической деятельности Лаахерского палеовулкана в Айфеле (Германия). Кристаллическая структура образца изучена методом рентгеноструктурного анализа. Результаты. Несмотря на повышение симметрии до пространственной группы P21/a по сравнению с ранее полученными данными в рамках P21/m, основной мотив и характер распределения катионов по октаэдрическим и тетраэдрическим позициям сохраняется, хотя из-за меньшего числа независимых позиций оно становится менее упорядоченным. Выполненный кристаллохимический анализ структур природных и синтетических представителей группы чевкинита в рамках формализма OD-теории позволил объединить их в единое OD-семейство, симметрия которого описывается единым OD-группоидом. Выводы. Топологический анализ минералов группы чевкинита позволил выделить два структурных OD-подсемейства (чевкинита и перрьерита), а также проанализировать симметрию гипотетических ромбических MDO-политипов.

Research subject. The crystal structure of christofschäferite-(Ce) was previously refined in terms of the P21/m low-symmetrical space group, which allowed the local features of cationic arrangements to be determined. In this work, we set out to refine the crystal structure of christofschäferite-(Ce) in terms of the P21/a high-symmetrical space group based on the previously collected diffraction data. A topology-symmetrical analysis of the members of the chevkinite group with the general formula of A4BC2D2(Si2O7)2O8 was conducted. Materials and methods. A magmatic rock sample with christofschäferite-(Ce) inclusions was found in the vicinity of the Laacher See volcano, near Mendig, Eifel Mountains, Rhineland-Palatinate (Rheinland-Pfalz), Germany. The crystal structure was studied using single-crystal X-ray analysis. Results. Despite an increase in the symmetry to the P21/a space group (in comparison with the previous data with the P21/m space group), the main patterns of cation distribution between the octahedral and tetrahedral sites are preserved. However, due to the lover number of cationic sites, this distribution becomes more disordered. Based on a crystal chemical analysis of the crystal structures of natural and synthetic members of the chevkinite group in the framework of the OD theory, it is possible to combine them into a united OD family with the same OD groupoid. Conclusions. According to the OD theory, there are two structural OD-subgroups of the chevkinite group (chevkinite and perrierite). The crystal structure and symmetry of possible MDO-polytypes are predicted.

чевкинитперрьериткристофшеферит-(Се)рентгеноструктурный анализOD-теориятопологиясложностьмодулярностьскунеритchevkiniteperrieritechristofschäferite-(Ce)X ray analysisOD-theorytopologycomplexitymodularityschooneriteРабота выполнена при финансовой поддержке гранта РНФ № 20-77-10065-П (анализ модулярности и политипии минералов группы чевкинита). Минералогические данные и данные о химическом составе получены в соответствии с темой государственного задания № 124013100858-3. Работа проведена частично в рамках выполнения государственного задания НИЦ “Курчатовский институт” (рентгеноструктурный анализ). Авторы благодарны двум анонимным рецензентам за ценные комментарии, а также академику С.Л. Вотякову за предложение подготовить статью по результатам, доложенным на конференции “Минералы: строение, свойства, методы исследования” в 2023 г.The work was supported by the Russian Science Foundation, grant No. 20-77-10065-П (Analysis of polytypism and modularity of chevkinite group minerals). 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The authors declare that there are no conflicts of interest present.