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  <front>
    <journal-meta>
      <journal-id journal-id-type="issn">2411-3336</journal-id>
      <journal-id journal-id-type="eissn">2541-9404</journal-id>
      <journal-title-group>
        <journal-title xml:lang="ru">Записки Горного института</journal-title>
        <journal-title xml:lang="en">Journal of Mining Institute</journal-title>
      </journal-title-group>
      <publisher>
        <publisher-name xml:lang="ru">Санкт-Петербургский горный университет императрицы Екатерины ΙΙ</publisher-name>
        <publisher-name xml:lang="en">Empress Catherine II Saint Petersburg Mining University</publisher-name>
      </publisher>
    </journal-meta>
    <article-meta>
      <article-id custom-type="pmi" pub-id-type="custom">pmi-15291</article-id>
      <article-id pub-id-type="uri">https://pmi.spmi.ru/pmi/article/view/15291</article-id>
      <article-categories>
        <subj-group subj-group-type="section-heading" xml:lang="ru">
          <subject>Геология</subject>
        </subj-group>
        <subj-group subj-group-type="section-heading" xml:lang="en">
          <subject>Geology</subject>
        </subj-group>
      </article-categories>
      <title-group>
        <article-title xml:lang="en">Interesting specimens of potassium feldspars in the Museum of the Mining Institute</article-title>
        <trans-title-group xml:lang="ru">
          <trans-title>Интересные образцы калистых полевых шпатов в Музее Горного Института</trans-title>
        </trans-title-group>
      </title-group>
      <contrib-group>
        <contrib contrib-type="author">
          <name name-style="eastern">
            <surname>Fedorov</surname>
            <given-names>Ye. S.</given-names>
          </name>
          <name-alternatives>
            <name name-style="eastern" xml:lang="ru">
              <surname>Федоров</surname>
              <given-names>Е. С.</given-names>
            </name>
            <name name-style="western" xml:lang="en">
              <surname>Fedorov</surname>
              <given-names>Ye. S.</given-names>
            </name>
          </name-alternatives>
          <email>pmi@spmi.ru</email>
          <xref ref-type="aff" rid="aff1"/>
        </contrib>
        <aff-alternatives id="aff1">
          <aff>
            <institution xml:lang="ru"> (Россия)</institution>
          </aff>
          <aff>
            <institution xml:lang="en"> (Russia)</institution>
          </aff>
        </aff-alternatives>
      </contrib-group>
      <pub-date pub-type="epub" iso-8601-date="1908-06-01">
        <day>01</day>
        <month>06</month>
        <year>1908</year>
      </pub-date>
      <pub-date date-type="collection">
        <year>1908</year>
      </pub-date>
      <volume>1</volume>
      <issue>2</issue>
      <fpage>163</fpage>
      <lpage>165</lpage>
      <history>
        <date date-type="received" iso-8601-date="1907-12-09">
          <day>09</day>
          <month>12</month>
          <year>1907</year>
        </date>
        <date date-type="accepted" iso-8601-date="1908-02-20">
          <day>20</day>
          <month>02</month>
          <year>1908</year>
        </date>
        <date date-type="rev-recd" iso-8601-date="1908-06-01">
          <day>01</day>
          <month>06</month>
          <year>1908</year>
        </date>
      </history>
      <permissions>
        <copyright-statement xml:lang="ru">© 1908 Е. С. Федоров</copyright-statement>
        <copyright-statement xml:lang="en">© 1908 Ye. S. Fedorov</copyright-statement>
        <copyright-year>1908</copyright-year>
        <copyright-holder xml:lang="ru">Е. С. Федоров</copyright-holder>
        <copyright-holder xml:lang="en">Ye. S. Fedorov</copyright-holder>
        <license license-type="open-access" xlink:href="http://creativecommons.org/licenses/by/4.0" xml:lang="ru">
          <license-p>Эта статья доступна по лицензии Creative Commons Attribution 4.0 International (CC BY 4.0)</license-p>
        </license>
        <license license-type="open-access" xlink:href="http://creativecommons.org/licenses/by/4.0" xml:lang="en">
          <license-p>This article is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0)</license-p>
        </license>
      </permissions>
      <self-uri xlink:type="simple" xlink:href="https://pmi.spmi.ru/pmi/article/view/15291">https://pmi.spmi.ru/pmi/article/view/15291</self-uri>
      <abstract xml:lang="ru">
        <p>Прежде всего интерес был вызван громадным Бавенским двойником ортоклаза из окрестностей Кяхты, изображенным на фиг. 1, и не только по отчетливости его образования, но и по прекрасным, включенным в него, кристаллам алмандина. Специальное оптическое исследование, произведенное В. И.Соколовым, показало, что вещество ортоклаза прорастается плагиоклазом около № 5, представляющим хорошо образованные полисинтетические двойники по альбитовому закону, причем один индивид двойника является согласно-брюнтированным с веществом ортоклаза.</p>
      </abstract>
      <abstract xml:lang="en">
        <p>First of all, interest was aroused by the huge Baveno twin of orthoclase from the vicinity of Kyakhta, depicted in Fig. 1, and not only due to the clarity of its formation, but also because of the beautiful almandine crystals included in it. A special optical study carried out by V.I. Sokolov showed that the orthoclase substance is intergrown by plagioclase at No. 5, forming well-developed polysynthetic twins according to the albite law, with one individual of the twin being conformably brunted with the orthoclase substance</p>
      </abstract>
    </article-meta>
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