The mineralogy of the historical Mochalin Log REE deposit, South Urals, Russia. Part IV. Alexkuznetsovite-(La), La2Mn(CO3)(Si2O7), alexkuznetsovite-(Ce), Ce2Mn(CO3)(Si2O7) and biraite-(La), La2Fe2+(CO3)(Si2O7), three new isostructural minerals and a definition of the biraite group

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F21%3A00124486" target="_blank" >RIV/00216224:14310/21:00124486 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.cambridge.org/core/journals/mineralogical-magazine/article/mineralogy-of-the-historical-mochalin-log-ree-deposit-south-urals-russia-part-iv-alexkuznetsovitela-la2mnco3si2o7-alexkuznetsovitece-ce2mnco3si2o7-and-biraitela-la2fe2co3si2o7-three-n" target="_blank" >https://www.cambridge.org/core/journals/mineralogical-magazine/article/mineralogy-of-the-historical-mochalin-log-ree-deposit-south-urals-russia-part-iv-alexkuznetsovitela-la2mnco3si2o7-alexkuznetsovitece-ce2mnco3si2o7-and-biraitela-la2fe2co3si2o7-three-n</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1180/mgm.2021.64" target="_blank" >10.1180/mgm.2021.64</a>

Jazyk výsledku

angličtina

Název v původním jazyce

The mineralogy of the historical Mochalin Log REE deposit, South Urals, Russia. Part IV. Alexkuznetsovite-(La), La2Mn(CO3)(Si2O7), alexkuznetsovite-(Ce), Ce2Mn(CO3)(Si2O7) and biraite-(La), La2Fe2+(CO3)(Si2O7), three new isostructural minerals and a definition of the biraite group

Popis výsledku v původním jazyce

Three new isostructural minerals, alexkuznetsovite-(La), ideally La2Mn(CO3)(Si2O7), alexkuznetsovite-(Ce) Ce2Mn(CO3)(Si2O7) and biraite-(La) La2Fe2+(CO3)(Si2O7), were discovered in polymineralic nodules from the Mochalin Log REE deposit, South Urals, Russia. The new minerals form anhedral grains up to 0.3 mm x 0.4 mm [alexkuznetsovite-(La)], 0.5 mm x 0.9 mm [alexkuznetsovite-(Ce)] and 0.2 mm x 1.2 mm [biraite-(La)] embedded in granular aggregates consisting of different REE minerals [allanite-(Ce)/-(La), bastnasite-(Ce)/-(La), fluorbritholite-(Ce), perbOeite-(Ce)/-(La), percleveite-(Ce)/-(La) and tornebohmite-(Ce)/-(La)]. All three new species are brown to dark brown, translucent in thin fragments, with white streak, vitreous lustre and Mohs' hardness of similar to 5. D-calc = 4.713 [alexkuznetsovite-(La)], 4.687 [alexkuznetsovite-(Ce)] and 4.682 [biraite-La)] g.cm(-3). Their empirical formulae, calculated on the basis of 2 Si and 10 O apfu, are: alexkuznetsovite-(La): (La0.98Ce0.89Nd0.10Pr0.05)(Sigma 2.02)Mn0.502+Fe0.292+Ca0.12Mg0.03(CO3)(0.94)(HCO3)(0.06) (Si2O7); alexkuznetsovite-(Ce): (Ce0.96La0.78Nd0.16Pr0.07)(Sigma 1.97)Th0.01Mn0.502+Fe0.332+Ca0.14Mg0.02(CO3)(0.93)(HCO3)(0.07)(Si2O7); and biraite-(La): (La0.95Ce0.87Nd0.08Pr0.04)(Sigma 1.94)Th0.01Ca0.12Fe0.442+Mn0.382+Mg0.07(CO3)(0.88)(HCO3)(0.12)(Si2O7). The new minerals are monoclinic, P2(1)/c and Z = 4. The unit-cell parameters of alexkuznetsovite-(La)/alexkuznetsovite-(Ce)/biraite-(La) are: a = 6.5642(3)/6.5764(4)/6.5660(10), b = 6.7689(3)/6.7685(4)/6.7666(11), c = 18.7213(10)/18.7493(15)/18.698(3) angstrom, beta = 108.684(6)/108.672(8)/108.952(16)degrees and V = 788.00(7)/790.66(10)/785.7(2) angstrom(3). The crystal structures are solved from single-crystal X-ray diffraction data; R = 0.0628 [alexkuznetsovite-(La)], 0.0589 [alexkuznetsovite-(Ce)] and 0.1193 [biraite-(La)]. A new biraite group is defined; it includes isostructural biraite-(Ce) and the three new minerals described herein. The rootname alexkuznetsovite is given in honour of the Russian mineral collector Alexey M. Kuznetsov (born 1962) who provided samples in which all three new minerals were found. The Levinson's suffix-modifier -(La) or -(Ce) indicates the predominance of La or Ce among REE in the mineral. Biraite-(La) is named as an analogue of biraite-(Ce) with La prevailing among REE.

Název v anglickém jazyce

The mineralogy of the historical Mochalin Log REE deposit, South Urals, Russia. Part IV. Alexkuznetsovite-(La), La2Mn(CO3)(Si2O7), alexkuznetsovite-(Ce), Ce2Mn(CO3)(Si2O7) and biraite-(La), La2Fe2+(CO3)(Si2O7), three new isostructural minerals and a definition of the biraite group

Popis výsledku anglicky

Three new isostructural minerals, alexkuznetsovite-(La), ideally La2Mn(CO3)(Si2O7), alexkuznetsovite-(Ce) Ce2Mn(CO3)(Si2O7) and biraite-(La) La2Fe2+(CO3)(Si2O7), were discovered in polymineralic nodules from the Mochalin Log REE deposit, South Urals, Russia. The new minerals form anhedral grains up to 0.3 mm x 0.4 mm [alexkuznetsovite-(La)], 0.5 mm x 0.9 mm [alexkuznetsovite-(Ce)] and 0.2 mm x 1.2 mm [biraite-(La)] embedded in granular aggregates consisting of different REE minerals [allanite-(Ce)/-(La), bastnasite-(Ce)/-(La), fluorbritholite-(Ce), perbOeite-(Ce)/-(La), percleveite-(Ce)/-(La) and tornebohmite-(Ce)/-(La)]. All three new species are brown to dark brown, translucent in thin fragments, with white streak, vitreous lustre and Mohs' hardness of similar to 5. D-calc = 4.713 [alexkuznetsovite-(La)], 4.687 [alexkuznetsovite-(Ce)] and 4.682 [biraite-La)] g.cm(-3). Their empirical formulae, calculated on the basis of 2 Si and 10 O apfu, are: alexkuznetsovite-(La): (La0.98Ce0.89Nd0.10Pr0.05)(Sigma 2.02)Mn0.502+Fe0.292+Ca0.12Mg0.03(CO3)(0.94)(HCO3)(0.06) (Si2O7); alexkuznetsovite-(Ce): (Ce0.96La0.78Nd0.16Pr0.07)(Sigma 1.97)Th0.01Mn0.502+Fe0.332+Ca0.14Mg0.02(CO3)(0.93)(HCO3)(0.07)(Si2O7); and biraite-(La): (La0.95Ce0.87Nd0.08Pr0.04)(Sigma 1.94)Th0.01Ca0.12Fe0.442+Mn0.382+Mg0.07(CO3)(0.88)(HCO3)(0.12)(Si2O7). The new minerals are monoclinic, P2(1)/c and Z = 4. The unit-cell parameters of alexkuznetsovite-(La)/alexkuznetsovite-(Ce)/biraite-(La) are: a = 6.5642(3)/6.5764(4)/6.5660(10), b = 6.7689(3)/6.7685(4)/6.7666(11), c = 18.7213(10)/18.7493(15)/18.698(3) angstrom, beta = 108.684(6)/108.672(8)/108.952(16)degrees and V = 788.00(7)/790.66(10)/785.7(2) angstrom(3). The crystal structures are solved from single-crystal X-ray diffraction data; R = 0.0628 [alexkuznetsovite-(La)], 0.0589 [alexkuznetsovite-(Ce)] and 0.1193 [biraite-(La)]. A new biraite group is defined; it includes isostructural biraite-(Ce) and the three new minerals described herein. The rootname alexkuznetsovite is given in honour of the Russian mineral collector Alexey M. Kuznetsov (born 1962) who provided samples in which all three new minerals were found. The Levinson's suffix-modifier -(La) or -(Ce) indicates the predominance of La or Ce among REE in the mineral. Biraite-(La) is named as an analogue of biraite-(Ce) with La prevailing among REE.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10504 - Mineralogy

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2021

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Mineralogical Magazine

ISSN

0026-461X

e-ISSN

1471-8022

Svazek periodika

85

Číslo periodika v rámci svazku

5

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

12

Strana od-do

772-783

Kód UT WoS článku

000723015700012

EID výsledku v databázi Scopus

2-s2.0-85112363418