Ferroindialite and Its Unique Symmetry: the Structure of Beryl Group Minerals
- Авторлар: Rastsvetaeva R.K1
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Мекемелер:
- Shubnikov Institute of Crystallography, Federal Scientific Research Centre “Crystallography and Photonics” RAS
- Шығарылым: № 8 (2022)
- Беттер: 29-36
- Бөлім: Articles
- URL: https://journals.eco-vector.com/0032-874X/article/view/627747
- DOI: https://doi.org/10.7868/S0032874X2208004X
- ID: 627747
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Ашық рұқсат
Рұқсат берілді
Рұқсат ақылы немесе тек жазылушылар үшін
Аннотация
Single crystal X-ray diffraction analysis has been used to study a cordierite group mineral found at the Bellerberg deposit (Eifel, Germany). This mineral is distinguished by the increased content of Fe in comparison with Mg in its chemical composition. The hexagonal cell parameters are a = 9.8759(3) Å, b = 9.3102(3) Å, V = 786.40(3) Å3. The crystal structure has been solved in the space group P622 and refined to final R-value of 5.9% for 860 independent reflections with |F| > 3σ(F). The main structural features of the mineral are reflected in its crystal chemical formula (Z = 1): K0.12[Fe2][(Mg0.85Fe0.15]2Al3[Al1.5Si1.5][Si8.4Al3.6]O36, where brackets denote the composition of the octahedral and tetrahedral structural sites. Studied mineral is an iron analogue of indialite with a highly ordered structure, reduced symmetry, and space group P622 that has been for the first time established in natural compounds.
Негізгі сөздер
Авторлар туралы
R. Rastsvetaeva
Shubnikov Institute of Crystallography, Federal Scientific Research Centre “Crystallography and Photonics” RAS
Email: rast.crys@gmail.com
Moscow, Russia
Әдебиет тізімі
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