Инд. авторы:	Romanenko A.V., Rashchenko S.V., Sokol A.G., Korsakov A.V., Seryotkin Y.V., Glazyrin K.V., Musiyachenko K.A.
Заглавие:	Crystal structures of K-cymrite and kokchetavite from single-crystal X-ray diffraction
Библ. ссылка:	Romanenko A.V., Rashchenko S.V., Sokol A.G., Korsakov A.V., Seryotkin Y.V., Glazyrin K.V., Musiyachenko K.A. Crystal structures of K-cymrite and kokchetavite from single-crystal X-ray diffraction // American Mineralogist. - 2021. - Vol.106. - Iss. 3. - P.404-409. - ISSN 0003-004X. - EISSN 1945-3027.
Идентиф-ры:	DOI: 10.2138/am-2020-7407; РИНЦ: 46765408; РИНЦ: 46765408; WoS: 000623798100006;
Реферат:	eng: We determined for the first time the crystal structures of high-pressure K-cymrite (KAlSi3O8 center dot H2O) and its dehydrated form kokchetavite (KAlSi3O8) using single-crystal X-ray diffraction. The K-cymrite structure has been successfully refined in the hexagonal space group P6/mmm [a = 5.3361(3) angstrom, c = 7.7081(7) angstrom, V= 190.08(3) angstrom(3), R1 = 0.036 for 127 unique observed reflections], which is in agreement with previous models from powder X-ray diffraction. In contrast, kokchetavite shows superstructural reflections, suggesting a different unit cell and a space group of P6/mcc [a = 10.5757(3)angstrom, c = 15.6404(6) angstrom, V= 1514.94(10) angstrom(3), R1 = 0.068 for 1455 unique observed reflections]. Upon dehydration, singlecrystal grains of K-cymrite transform into single-crystal grains of kokchetavite. The latter questions a previous interpretation of kokchetavite crystals in mineral inclusions as a product of direct crystallization from fluid/melt. The Raman spectrum of K-cymrite shows a strong polarization dependence, which is important in identification of the mineral inclusions.
Ключевые слова:	NITROGEN; MINERALS; BREAKDOWN; POLYMORPH; POTASSIUM-FELDSPAR; CONDITIONS BEAMLINE P02.2; Raman spectroscopy; single-crystal X-ray diffraction; kokchetavite; K-cymrite; SILICATE; ORIGIN;
Издано:	2021
Физ. хар-ка:	с.404-409
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