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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">627676</article-id><article-id pub-id-type="doi">10.7868/S0032874X22010033</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">Triclinic Afwillite and Other Finite Calcium Silicate Hydrates</article-title><trans-title-group xml:lang="ru"><trans-title>Триклинный афвиллит и другие островные гидросиликаты кальция</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”, RAS</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="2022-01-28" publication-format="electronic"><day>28</day><month>01</month><year>2022</year></pub-date><issue>1</issue><issue-title xml:lang="en">NO1 (2022)</issue-title><issue-title xml:lang="ru">№1 (2022)</issue-title><fpage>29</fpage><lpage>38</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 ©; 2022, Издательство «Наука»</copyright-statement><copyright-year>2022</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/627676">https://journals.eco-vector.com/0032-874X/article/view/627676</self-uri><abstract xml:lang="en"><p>Calcium silicate hydrates (CSH) are widespread in nature and are commonly used in cement production. Their cationic composition consists only of Ca and Si, and the chemical variations of this family result from the variations of Ca/Si ratio, anionic composition, and hydration degree. The structural diversity of this family is related to the variations of Ca polyhedral fragments and Si radicals as well as to their topology and symmetry in the structure. Earlier I presented in “Priroda” the structure of fukalite and closely related calcium silicate hydrates with infinite oxygen radicals. This work is dedicated to the X-ray analysis of another member of the CSH family, afwillite, with isolated SiO4 tetrahedra and other calcium silicate hydrates with finite Si-radicals and their combinations.</p></abstract><trans-abstract xml:lang="ru"><p>Гидросиликаты Са (CSH) широко распространены в природе и находят применение в цементной промышленности. В их катионном составе есть только кальций и кремний, а химическое разнообразие обусловлено отношением Ca/Si, составом анионов и степенью гидратированности. Структурное многообразие этого семейства связано с вариациями фрагментов из Ca-полиэдров и Si-радикалов, а также топологией и симметрией их расположения в структуре. Ранее я писала в «Природе» о строении минерала фукалита и родственных ему гидросиликатов кальция с протяженными кремнекислородными радикалами. В данной работе рассказывается о рентгеноструктурном исследовании другого представителя CSH-семейства — минерала афвиллита, в котором содержатся изолированные SiO4-тетраэдры, и о гидросиликатах кальция с островными Si,O-радикалами и их комбинациями.</p></trans-abstract><kwd-group xml:lang="en"><kwd>afwillite</kwd><kwd>calcium silicate hydrates</kwd><kwd>CSH-family</kwd><kwd>cement minerals</kwd><kwd>crystal structure</kwd><kwd>Ca-polyhedra</kwd><kwd>Si-tetrahedra</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>афвиллит</kwd><kwd>гидросиликаты кальция</kwd><kwd>CSH-семейство</kwd><kwd>цементные минералы</kwd><kwd>кристаллическая структура</kwd><kwd>Ca-полиэдры</kwd><kwd>Si-тетраэдры</kwd></kwd-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Parry J., Wright F.E. Afwillite, a new hydrous calcium silicate, from Dutoitspan Mine, Kimberley, South Africa. Mineral. 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