Další formáty:
BibTeX
LaTeX
RIS
@article{1734497,
author = {Kasatkin, Anatoly V. and Zubkova, Natalia V. and Pekov, Igor V. and Chukanov, Nikita V. and Škoda, Radek and Agakhanov, Atali A. and Belakovskiy, Dmitriy I. and Ksenofontov, Dmitriy A. and Plášil, Jakub and Kuznetsov, Aleksey M. and Britvin, Sergey N. and Pushcharovsky, Dmitry Yu.},
article_number = {6},
doi = {http://dx.doi.org/10.1180/mgm.2020.81},
keywords = {crystal structure; Mochalin Log; new mineral; percleveite-(La); Raman spectrum; rare-earth disilicate; South Urals},
language = {eng},
issn = {0026-461X},
journal = {Mineralogical Magazine},
title = {The mineralogy of the historical Mochalin Log REE deposit, South Urals, Russia. Part III. Percleveite-(La), La2Si2O7, a new REE disilicate mineral},
url = {https://doi.org/10.1180/mgm.2020.81},
volume = {84},
year = {2020}
}
TY - JOUR
ID - 1734497
AU - Kasatkin, Anatoly V. - Zubkova, Natalia V. - Pekov, Igor V. - Chukanov, Nikita V. - Škoda, Radek - Agakhanov, Atali A. - Belakovskiy, Dmitriy I. - Ksenofontov, Dmitriy A. - Plášil, Jakub - Kuznetsov, Aleksey M. - Britvin, Sergey N. - Pushcharovsky, Dmitry Yu.
PY - 2020
TI - The mineralogy of the historical Mochalin Log REE deposit, South Urals, Russia. Part III. Percleveite-(La), La2Si2O7, a new REE disilicate mineral
JF - Mineralogical Magazine
VL - 84
IS - 6
SP - 913-920
EP - 913-920
PB - Cambridge University Press
SN - 0026461X
KW - crystal structure
KW - Mochalin Log
KW - new mineral
KW - percleveite-(La)
KW - Raman spectrum
KW - rare-earth disilicate
KW - South Urals
UR - https://doi.org/10.1180/mgm.2020.81
L2 - https://doi.org/10.1180/mgm.2020.81
N2 - The new mineral percleveite-(La) (IMA2019-037), ideally La2Si2O7, was found in polymineralic nodules of the Mochalin Log REE deposit, Chelyabinsk Oblast, South Urals, Russia. It is associated with allanite-(Ce), allanite-(La), bastnasite-(Ce), bastnasite-(La), ferriallanite-(Ce), ferriallanite-(La), ferriperbOeite-(Ce), ferriperbOeite-(La), fluorbritholite-(Ce), hydroxylbastnasite-(Ce), perbOeite-(Ce), perbOeite-(La), tornebohmite-(Ce) and tornebohmite-(La). Percleveite-(La) occurs as isolated anhedral grains commonly up to 0.2 mm x 0.4 mm and very rarely up to 1 mm x 1 mm. The new mineral is transparent with greasy lustre. The mineral is very pale yellow to colourless in thin fragments to light yellow in aggregates. It is brittle, with imperfect {001} cleavage and an uneven fracture. Mohs' hardness is ca. 6. D-calc = 5.094 g cm(-3). Under the microscope, percleveite-(La) is non-pleochroic, optically uniaxial (+), omega = 1.825(10) and = 1.835(10). The Raman spectrum is given. Chemical data (wt.%, electron-microprobe) are: La2O3 36.80, Ce2O3 31.22, Pr2O3 1.57, Nd2O3 2.96, SiO2 26.73, total 99.28. The empirical formula based on 7 O apfu is (La1.02Ce0.86Nd0.08Pr0.04)(Sigma 2.00)Si2.00O7. Percleveite-(La) is tetragonal, P4(1); the unit-cell parameters are: a = 6.8482(3), c = 24.8550(13) angstrom, V = 1165.64(11) angstrom(3) and Z = 8. The strongest reflections in the powder X-ray diffraction pattern [d, angstrom(I)(hkl)] are: 4.194(18)(113), 3.564(16)(106), 3.349(16)(201,202), 3.157(100)(203,116,008), 3.043(22)(211), 2.934(39)(122), 2.893(29)(213) and 2.864(21)(117). The crystal structure of percleveite-(La) is solved from the single-crystal X-ray diffraction data [R = 0.0617 for 2831 unique reflections with I > 2 sigma(I)]. The new mineral is named as an analogue of percleveite-(Ce) with La predominance over the rare-earth elements.
ER -
KASATKIN, Anatoly V., Natalia V. ZUBKOVA, Igor V. PEKOV, Nikita V. CHUKANOV, Radek ŠKODA, Atali A. AGAKHANOV, Dmitriy I. BELAKOVSKIY, Dmitriy A. KSENOFONTOV, Jakub PLÁŠIL, Aleksey M. KUZNETSOV, Sergey N. BRITVIN a Dmitry Yu. PUSHCHAROVSKY. The mineralogy of the historical Mochalin Log REE deposit, South Urals, Russia. Part III. Percleveite-(La), La2Si2O7, a new REE disilicate mineral. \textit{Mineralogical Magazine}. Cambridge University Press, 2020, roč.~84, č.~6, s.~913-920. ISSN~0026-461X. Dostupné z: https://dx.doi.org/10.1180/mgm.2020.81.
|
