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<article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="research-article" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Priroda</journal-id><journal-title-group><journal-title xml:lang="en">Priroda</journal-title><trans-title-group xml:lang="ru"><trans-title>Природа</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0032-874X</issn><publisher><publisher-name xml:lang="en">Akademizdatcenter Nauka</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">627781</article-id><article-id pub-id-type="doi">10.7868/S0032874X23020047</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Articles</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Статьи</subject></subj-group><subj-group subj-group-type="article-type"><subject>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">Heavyweights in the World of Minerals: Rossovskyite, Ixiolite, and Other Tantalum.Niobates</article-title><trans-title-group xml:lang="ru"><trans-title>Тяжеловесы в мире минералов: россовскиит, иксиолит и другие тантало-ниобаты</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Rastsvetaeva</surname><given-names>R. K</given-names></name><name xml:lang="ru"><surname>Расцветаева</surname><given-names>Р. К</given-names></name></name-alternatives><email>rast.crys@gmail.com</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Shubnikov Institute of Crystallography, Federal Scientific Research Centre “Crystallography and Photonics”, Russian Academy of Sciences</institution></aff><aff><institution xml:lang="ru">Институт кристаллографии имени А.В.Шубникова Федерального научно-исследовательского центра «Кристаллография и фотоника» РАН</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2023-02-28" publication-format="electronic"><day>28</day><month>02</month><year>2023</year></pub-date><issue>2</issue><issue-title xml:lang="en">NO ()</issue-title><issue-title xml:lang="ru">№ (2)</issue-title><fpage>39</fpage><lpage>48</lpage><history><date date-type="received" iso-8601-date="2024-03-01"><day>01</day><month>03</month><year>2024</year></date></history><permissions><copyright-statement xml:lang="ru">Copyright ©; 1970, Издательство «Наука»</copyright-statement><copyright-year>1970</copyright-year><copyright-holder xml:lang="ru">Издательство «Наука»</copyright-holder></permissions><self-uri xlink:href="https://journals.eco-vector.com/0032-874X/article/view/627781">https://journals.eco-vector.com/0032-874X/article/view/627781</self-uri><abstract xml:lang="en"><p>The new mineral rossovskyite (Fe3+,Ta)(Nb,Ti)O4 from the tantalum-niobate family was discovered in granite pegmatites of Altai Mountains in Western Mongolia. Topologically the structure of rossovskyite is analogous to that of ixiolite with the same cell-structure, but differs in cations ordering with a decrease in symmetry from orthorhombic one with the Pbcn space group to monoclinic with the P2/c space group. Although they display substantial common features, these minerals belonging to the tantalum-niobate family vary in cell size, symmetry, and cation ordering; some of them serve as a source of niobium and tantalum. This article describes the study and discovery of the mineral rossovskyite and describes related minerals of the tantalum-niobate family.</p></abstract><trans-abstract xml:lang="ru"><p>Новый минерал россовскиит (Fe3+,Ta)(Nb,Ti)O4, принадлежащий семейству тантало-ниобатов, найден в гранитных пегматитах Алтайских гор в Западной Монголии. Структура минерала топологически аналогична структуре иксиолита с такими же параметрами ячейки, но отличается упорядочением катионов с понижением симметрии от ромбической с пространственной группой Pbcn до моноклинной — с пространственной группой Р2/c. Тантало-ниобаты разнообразны по размерам ячейки, симметрии и катионному упорядочению, а некоторые из них служат источником ниобия и тантала. В статье рассказывается об изучении и открытии минерала россовскиита и описываются родственные ему члены семейства тантало-ниобатов.</p></trans-abstract><kwd-group xml:lang="en"><kwd>new mineral</kwd><kwd>tantalum-niobates</kwd><kwd>rossovskyite</kwd><kwd>ixiolite</kwd><kwd>crystal structure</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>россовскиит</kwd><kwd>иксиолит</kwd><kwd>новый минерал</kwd><kwd>тантало-ниобаты</kwd><kwd>кристаллическая структура</kwd></kwd-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Гурбанова О.А., Расцветаева Р.К., Кашаев А.А., Смолин А.С. Уточненная кристаллическая структура TR-ферсмита. Кристаллография. 2001; 46(2): 234–235.</mixed-citation></ref><ref id="B2"><label>2.</label><mixed-citation>Grice J.D., Ferguson R.B., Hawthorne F.C. The crystal structures of tantalite, ixiolite and wodginite from Bernic lake, Manitoba I. Tantalite and ixiolite. 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