Сибирский федеральный университет

Тип публикации: статья из журнала

Год издания: 2015

Идентификатор DOI: 10.1134/S1063774515040045

Ключевые слова: Iodine, Lithium, Magnesium, Single crystals, X ray diffraction, Anisotropic approximation, Atomic displacement, Chemical compositions, Microtwinning, Monoclinic units, Pseudo-merohedral twinning, Single crystal x-ray diffraction, Crystal structure

Аннотация: The structure of ferro-pedrizite-a new lithium mineral of the amphibole supergroup-has been studied by single-crystal X-ray diffraction. Fe2+ ions dominate over Mg in the chemical composition of this mineral. The parameters of the monoclinic unit cell are a = 9.3716(4) angstrom, b = 17.649(1) angstrom, c = 5.2800(6) angstrom, and beta = 102.22(1)degrees. The experimental set of intensities contains a large number of significant reflections (similar to 10%), which violate the Clattice. Consideration of pseudomerohedral twinning (matrix [100/0 (1) over bar0/-3/40 (1) over bar]) allowed us to solve and refine the structure within the sp. gr. C2/m to the final value R = 3.9% in the anisotropic approximation of atomic displacements using 4843I > 2 sigma(I). The twin components are found to be 0.681(3)/0.319(3). Twinning has been revealed for the first time in amphiboles of the pedrizite family. The idealized formula of ferro-pedrizite (Z = 2) is determined as NaLi2(Fe22+Al2Li)[Si8O22](OH)(2).

Журнал: CRYSTALLOGRAPHY REPORTS

Выпуск журнала: Vol. 60, Is. 4

Номера страниц: 493-497

ISSN журнала: 10637745

Место издания: NEW YORK

Издатель: MAIK NAUKA/INTERPERIODICA/SPRINGER

• Aksenov S.M. (Moscow State University)
• Rastsvetaeva R.K. (Shubnikov Institute of Crystallography, Russian Academy of Sciences)
• Miroshkina A.E. (Moscow State University)
• Konovalenko S.I. (Tomsk Polytechnic University)
• Ananyev S.A. (Siberian Federal University)
• Chukanov N.V. (Institute of Problems of Chemical Physics, Russian Academy of Sciences)

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