TY - JOUR

T1 - A unique mineral of the pyrochlore supergroup from Baikal region (addition to its first description made by V. I. Vernadsky)

AU - Rikhvanov, L. P.

AU - Strakhovenko, V. D.

AU - Smirnov, S. Z.

AU - Litasov, Y. D.

AU - Kulinich, E. A.

PY - 2018/1/1

Y1 - 2018/1/1

N2 - In the early 20th century, new radioactive mineral was found near the Baikal Lake. Academician Vladimir Vernadsky named it «mendeleevitå». Unfortunately this mineral was not characterized by the Russian scientists and name «mendeleevitå» was discredited because of the lack of modern accurate data for the approval of an independent mineral species. Any process of scientific knowledge requires deep and accurate information of the studied object or phenomenon in the place of its initial detection (holotype in mineralogy, rock type in petrography, etc). The veracity is required for perception of the historical background of the term «mendeleevitå», investigation of this mineral and, finally, determination of position of this mineral in the modern mineralogical classification. The main aim of the study is to investigate the sample of historical highly radioactive mineral from the group of tantalum-niobates and to identify the place of «mendeleevitå» in the modern classification of minerals of pyrochlore supergroup. The methods used in the study are X-ray diffraction analysis, electron microscopy, energy dispersive spectroscopy, infrared spectroscopy, and thermal analysis. As a result, authors investigated the holotype of the «mendeleevitå». It was found that the mineral is isometric, highly radioactive and metamict. The crystal structure of «mendeleevit» is determined only after calcination at the temperature of 800 °C. Elementary lattice parameters are 10.23-10.26 Å. This parameters correspond to the lower limit of value range for the group of pyrochlore-betafite. According to the modern mineralogical nomenclature, «mendeleevitå» can be determine as oxyuranobetafite from pyrochlore supergroup. «Mendeleevitå» does not include significant detectable quantity of thorium and rare earths.

AB - In the early 20th century, new radioactive mineral was found near the Baikal Lake. Academician Vladimir Vernadsky named it «mendeleevitå». Unfortunately this mineral was not characterized by the Russian scientists and name «mendeleevitå» was discredited because of the lack of modern accurate data for the approval of an independent mineral species. Any process of scientific knowledge requires deep and accurate information of the studied object or phenomenon in the place of its initial detection (holotype in mineralogy, rock type in petrography, etc). The veracity is required for perception of the historical background of the term «mendeleevitå», investigation of this mineral and, finally, determination of position of this mineral in the modern mineralogical classification. The main aim of the study is to investigate the sample of historical highly radioactive mineral from the group of tantalum-niobates and to identify the place of «mendeleevitå» in the modern classification of minerals of pyrochlore supergroup. The methods used in the study are X-ray diffraction analysis, electron microscopy, energy dispersive spectroscopy, infrared spectroscopy, and thermal analysis. As a result, authors investigated the holotype of the «mendeleevitå». It was found that the mineral is isometric, highly radioactive and metamict. The crystal structure of «mendeleevit» is determined only after calcination at the temperature of 800 °C. Elementary lattice parameters are 10.23-10.26 Å. This parameters correspond to the lower limit of value range for the group of pyrochlore-betafite. According to the modern mineralogical nomenclature, «mendeleevitå» can be determine as oxyuranobetafite from pyrochlore supergroup. «Mendeleevitå» does not include significant detectable quantity of thorium and rare earths.

KW - Academician vernadsky

KW - Baikal

KW - Mendeleev

KW - Oxyuranobetafite

KW - Pyrochlore supergroup

KW - Radioactive minerals

KW - Radioactivity

UR - http://www.scopus.com/inward/record.url?scp=85063746127&partnerID=8YFLogxK

U2 - 10.30695/zrmo/2018.1476.03

DO - 10.30695/zrmo/2018.1476.03

M3 - Article

AN - SCOPUS:85063746127

VL - 147

SP - 75

EP - 89

JO - Zapiski Rossiiskogo Mineralogicheskogo Obshchestva

JF - Zapiski Rossiiskogo Mineralogicheskogo Obshchestva

SN - 0869-6055

IS - 6

ER -