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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-15496</article-id>
      <article-id pub-id-type="uri">https://pmi.spmi.ru/pmi/article/view/15496</article-id>
      <article-categories>
        <subj-group subj-group-type="section-heading" xml:lang="ru">
          <subject>Статьи</subject>
        </subj-group>
        <subj-group subj-group-type="section-heading" xml:lang="en">
          <subject>Articles</subject>
        </subj-group>
      </article-categories>
      <title-group>
        <article-title xml:lang="en">Enigmatic facets of quartz</article-title>
        <trans-title-group xml:lang="ru">
          <trans-title>Энигматические грани кварца</trans-title>
        </trans-title-group>
      </title-group>
      <contrib-group>
        <contrib contrib-type="author">
          <name name-style="eastern">
            <surname>Fedorov</surname>
            <given-names>E. 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>E. 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="1912-12-01">
        <day>01</day>
        <month>12</month>
        <year>1912</year>
      </pub-date>
      <pub-date date-type="collection">
        <year>1912</year>
      </pub-date>
      <volume>3</volume>
      <fpage>170</fpage>
      <lpage>170</lpage>
      <history>
        <date date-type="received" iso-8601-date="1912-06-13">
          <day>13</day>
          <month>06</month>
          <year>1912</year>
        </date>
        <date date-type="accepted" iso-8601-date="1912-08-16">
          <day>16</day>
          <month>08</month>
          <year>1912</year>
        </date>
        <date date-type="rev-recd" iso-8601-date="1912-12-01">
          <day>01</day>
          <month>12</month>
          <year>1912</year>
        </date>
      </history>
      <permissions>
        <copyright-statement>© E. S. Fedorov</copyright-statement>
        <copyright-year>1912</copyright-year>
        <copyright-holder xml:lang="ru">Е. С. Федоров</copyright-holder>
        <copyright-holder xml:lang="en">E. S. Fedorov</copyright-holder>
        <license xlink:href="http://creativecommons.org/licenses/by/4.0">
          <license-p>CC BY 4.0</license-p>
        </license>
      </permissions>
      <self-uri xlink:type="simple" xlink:href="https://pmi.spmi.ru/pmi/article/view/15496">https://pmi.spmi.ru/pmi/article/view/15496</self-uri>
      <abstract xml:lang="ru">
        <p>На энигматические грани практически можно смотреть как на иррациональные, недопускаемые основными законами кристаллографии. Предположение их иррациональности подтверждено и их зарастанием при контакте с важною гранью комплекса, смоченном насыщенным раствором вещества, причем часть последней грани подвергается растворению. Кроме этой характеристики, энигматические грани ха­рактеризуются своею одиночностью и неповторяемостью.</p>
      </abstract>
      <abstract xml:lang="en">
        <p>Enigmatic faces can practically be viewed as irrational, not allowed by the basic laws of crystallography. The assumption of their irrationality is also confirmed by their overgrowth upon contact with an important face of the complex, moistened with a saturated solution of the substance, and part of the last face is subject to dissolution. In addition to this characteristic, enigmatic facets are characterized by their isolation and uniqueness.</p>
      </abstract>
    </article-meta>
  </front>
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      <ref id="ref1">
        <label>1</label>
        <mixed-citation xml:lang="ru">-</mixed-citation>
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