The mineralogy of the historical Mochalin Log REE deposit, South Urals, Russia; Part II, Radekskodaite-(La), (CaLa5)(Al4Fe2+)[Si2O7][SiO4]5O(OH)3 and radekskodaite-(Ce), (CaCe5)(Al4Fe2+)[Si2O7][SiO4]5O(OH)3, two new minerals with a novel structure-type belonging to the epidote-törnebohmite polysomatic series
Two new isostructural minerals radekskodaite-(La) (CaLa5)(Al4Fe2+)[Si2O7][SiO4]5O(OH)3 and radekskodaite-(Ce) (CaCe5)(Al4Fe2+)[Si2O7][SiO4]5O(OH)3 were discovered in polymineralic nodules from the Mochalin Log REE deposit, South Urals, Russia. Radekskodaite-(La) is associated with allanite-(Ce), all...
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| Veröffentlicht in: | Mineralogical magazine 2020-12, Vol.84 (6), p.839-853 |
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| creator | Kasatkin, Anatoly V Zubkova, Natalia V Pekov, Igor V Chukanov, Nikita V Ksenofontov, Dmitriy A Agakhanov, Atali A Belakovskiy, Dmitriy I Polekhovsky, Yury S Kuznetsov, Aleksey M Britvin, Sergey N Pushcharovsky, Dmitry Yu Nestola, Fabrizio |
| description | Two new isostructural minerals radekskodaite-(La) (CaLa5)(Al4Fe2+)[Si2O7][SiO4]5O(OH)3 and radekskodaite-(Ce) (CaCe5)(Al4Fe2+)[Si2O7][SiO4]5O(OH)3 were discovered in polymineralic nodules from the Mochalin Log REE deposit, South Urals, Russia. Radekskodaite-(La) is associated with allanite-(Ce), allanite-(La), bastnasite-(Ce), bastnasite-(La), ferriallanite-(Ce), ferriallanite-(La), ferriperboeite-(La), fluorbritholite-(Ce), tornebohmite-(Ce) and tornebohmite-(La). Radekskodaite-(Ce) is associated with ancylite-(Ce), bastnasite-(Ce), bastnasite-(La), lanthanite-(La), perboeite-(Ce) and tornebohmite-(Ce). The new minerals form isolated anhedral grains up to 0.35×0.75 mm [radekskodaite-(La)] and 1 mm ×2 mm [radekskodaite-(Ce)]. Both minerals are greenish-brown with vitreous lustre. Dcalc=4.644 [radekskodaite-(La)] and 4.651 [radekskodaite-(Ce)] g cm-3. Both minerals are optically biaxial (+); radekskodaite-(La): α=1.790(7), β=1.798(5), γ=1.825(8) and 2Vmeas=60(10)°; radekskodaite-(Ce): α=1.798(6), β=1.806(6), γ=1.833(8) and 2Vmeas=65(10)°. Chemical data [wt.%, electron-microprobe; FeO:Fe2O3 by charge balance; H2O by stochiometry; radekskodaite-(La)/radekskodaite-(Ce)] are: CaO 3.40/2.74, La2O3 27.68/22.23, Ce2O3 20.39/24.30, Pr2O3 0.94/1.48, Nd2O3 1.71/3.18, ThO2 0.23/0.24, MgO 0.85/1.04, Al2O3 10.35/10.84, MnO 0.64/0.69, FeO 2.55/2.76, Fe2O3 3.12/2.57, TiO2 0.13/0.04, SiO2 26.03/26.10, F 0.10/0.09, H2O 1.62/1.63, -O=F -0.04/-0.04, total 99.70/99.89. The empirical formulae based on O28(OH,F)3 are: radekskodaite-(La): (Ca0.98Th0.01La2.75Ce2.01Nd0.16Pr0.09)Σ6.00 (Al3.28Fe3+0.63Fe2+0.57Mg0.34Mn0.15Ti0.03)Σ5.00 Si7.00O28[(OH)2.91F0.09]; radekskodaite-(Ce): (Ca0.79Mn0.16Th0.01Ce2.39La2.20Nd0.30Pr0.14)Σ5.99 (Al3.43Fe2+0.62Fe3+0.52Mg0.42Ti0.01)Σ5.00 Si7.00O28[(OH)2.92F0.08]. Both minerals are monoclinic, P21/m; the unit-cell parameters [radekskodaite-(La)/radekskodaite-(Ce)] are: a=8.9604(3)/8.9702(4), b=5.7268(2)/5.7044(2), c=25.1128(10)/25.1642(13) Å, β=116.627(5)/116.766(6)°, V=1151.98(7)/1149.68(11) Å3 and Z=2/2. The crystal structures are solved based on single-crystal X-ray diffraction data; R=0.0554 [radekskodaite-(La)] and 0.0769 [radekskodaite-(Ce)]. Both minerals belong to the epidote-tornebohmite polysomatic series and represent first members of ET2-type: their structure consists of regular alternating modules, one slab of the epidote (E) structure and two slabs of tornebohmite (T). The rootname radekskodaite is given in honor of the Czech mineralogist R |
| doi_str_mv | 10.1180/mgm.2020.64 |
| format | Article |
| fullrecord | <record><control><sourceid>proquest_geosc</sourceid><recordid>TN_cdi_proquest_journals_2477591486</recordid><sourceformat>XML</sourceformat><sourcesystem>PC</sourcesystem><sourcerecordid>2477591486</sourcerecordid><originalsourceid>FETCH-LOGICAL-g646-ca0fce4473f6297576c03407ecbffba5b93903c40b30f01c417d31ece0c93e983</originalsourceid><addsrcrecordid>eNqFj1Fr1EAUhaMouFaf_AMXfNmlm3VmMkk29KmErV2IRNoVBCnLZHKTTJtk4szEZf9Y_0D_mMFV0CefLhzOd849nveOkhWla_Khq7sVI4ysIv7cm1EeU39NGHvhzQhhkc8j-vWV99rae0IopyGbPYt2DUKnejSi1fURdAVuUhplnTZKihY-admIVvWQ6RpuNhsocdBWuSXc6tE18GUi7RJuRmuVuIDPwjjYbidBlPhgH3QplEN_nonFEuapyES4mF-2_ArZ-eLbrWJ5fDednN-F-Ty_XgQg-hLMv3CKJzjF_8BLcAcNPR7-bLJwUNOTAnr9A1uwzozSjQZ9dxwQCmx1X6u-Bqd_7cZBlXpqdE-PpsdCN93UD4Nuj1Z3wikJFo1C-8Z7WU3h-Pb3PfN2V5tdeu1n-cdtepn5dcQjXwpSSeQ8DqqIJXEYR5IEnMQoi6oqRFgkQUICyUkRkIpQyWlcBhQlEpkEmKyDM-_9KXYw-vuI1u3v9Wj6qXHPeByHCeXraHKdn1w1aisV9hIP2rTlX2bC6J7QJObr4CfSdqrb</addsrcrecordid><sourcetype>Aggregation Database</sourcetype><iscdi>true</iscdi><recordtype>article</recordtype><pqid>2477591486</pqid></control><display><type>article</type><title>The mineralogy of the historical Mochalin Log REE deposit, South Urals, Russia; Part II, Radekskodaite-(La), (CaLa5)(Al4Fe2+)[Si2O7][SiO4]5O(OH)3 and radekskodaite-(Ce), (CaCe5)(Al4Fe2+)[Si2O7][SiO4]5O(OH)3, two new minerals with a novel structure-type belonging to the epidote-törnebohmite polysomatic series</title><source>Cambridge University Press Journals Complete</source><creator>Kasatkin, Anatoly V ; Zubkova, Natalia V ; Pekov, Igor V ; Chukanov, Nikita V ; Ksenofontov, Dmitriy A ; Agakhanov, Atali A ; Belakovskiy, Dmitriy I ; Polekhovsky, Yury S ; Kuznetsov, Aleksey M ; Britvin, Sergey N ; Pushcharovsky, Dmitry Yu ; Nestola, Fabrizio</creator><creatorcontrib>Kasatkin, Anatoly V ; Zubkova, Natalia V ; Pekov, Igor V ; Chukanov, Nikita V ; Ksenofontov, Dmitriy A ; Agakhanov, Atali A ; Belakovskiy, Dmitriy I ; Polekhovsky, Yury S ; Kuznetsov, Aleksey M ; Britvin, Sergey N ; Pushcharovsky, Dmitry Yu ; Nestola, Fabrizio</creatorcontrib><description>Two new isostructural minerals radekskodaite-(La) (CaLa5)(Al4Fe2+)[Si2O7][SiO4]5O(OH)3 and radekskodaite-(Ce) (CaCe5)(Al4Fe2+)[Si2O7][SiO4]5O(OH)3 were discovered in polymineralic nodules from the Mochalin Log REE deposit, South Urals, Russia. Radekskodaite-(La) is associated with allanite-(Ce), allanite-(La), bastnasite-(Ce), bastnasite-(La), ferriallanite-(Ce), ferriallanite-(La), ferriperboeite-(La), fluorbritholite-(Ce), tornebohmite-(Ce) and tornebohmite-(La). Radekskodaite-(Ce) is associated with ancylite-(Ce), bastnasite-(Ce), bastnasite-(La), lanthanite-(La), perboeite-(Ce) and tornebohmite-(Ce). The new minerals form isolated anhedral grains up to 0.35×0.75 mm [radekskodaite-(La)] and 1 mm ×2 mm [radekskodaite-(Ce)]. Both minerals are greenish-brown with vitreous lustre. Dcalc=4.644 [radekskodaite-(La)] and 4.651 [radekskodaite-(Ce)] g cm-3. Both minerals are optically biaxial (+); radekskodaite-(La): α=1.790(7), β=1.798(5), γ=1.825(8) and 2Vmeas=60(10)°; radekskodaite-(Ce): α=1.798(6), β=1.806(6), γ=1.833(8) and 2Vmeas=65(10)°. Chemical data [wt.%, electron-microprobe; FeO:Fe2O3 by charge balance; H2O by stochiometry; radekskodaite-(La)/radekskodaite-(Ce)] are: CaO 3.40/2.74, La2O3 27.68/22.23, Ce2O3 20.39/24.30, Pr2O3 0.94/1.48, Nd2O3 1.71/3.18, ThO2 0.23/0.24, MgO 0.85/1.04, Al2O3 10.35/10.84, MnO 0.64/0.69, FeO 2.55/2.76, Fe2O3 3.12/2.57, TiO2 0.13/0.04, SiO2 26.03/26.10, F 0.10/0.09, H2O 1.62/1.63, -O=F -0.04/-0.04, total 99.70/99.89. The empirical formulae based on O28(OH,F)3 are: radekskodaite-(La): (Ca0.98Th0.01La2.75Ce2.01Nd0.16Pr0.09)Σ6.00 (Al3.28Fe3+0.63Fe2+0.57Mg0.34Mn0.15Ti0.03)Σ5.00 Si7.00O28[(OH)2.91F0.09]; radekskodaite-(Ce): (Ca0.79Mn0.16Th0.01Ce2.39La2.20Nd0.30Pr0.14)Σ5.99 (Al3.43Fe2+0.62Fe3+0.52Mg0.42Ti0.01)Σ5.00 Si7.00O28[(OH)2.92F0.08]. Both minerals are monoclinic, P21/m; the unit-cell parameters [radekskodaite-(La)/radekskodaite-(Ce)] are: a=8.9604(3)/8.9702(4), b=5.7268(2)/5.7044(2), c=25.1128(10)/25.1642(13) Å, β=116.627(5)/116.766(6)°, V=1151.98(7)/1149.68(11) Å3 and Z=2/2. The crystal structures are solved based on single-crystal X-ray diffraction data; R=0.0554 [radekskodaite-(La)] and 0.0769 [radekskodaite-(Ce)]. Both minerals belong to the epidote-tornebohmite polysomatic series and represent first members of ET2-type: their structure consists of regular alternating modules, one slab of the epidote (E) structure and two slabs of tornebohmite (T). The rootname radekskodaite is given in honor of the Czech mineralogist Radek Skoda (born 1979), Associate Professor at Masaryk University, Brno, Czech Republic. The suffix-modifier -(La) or -(Ce) indicates the predominance of La or Ce among REE in the mineral.</description><identifier>ISSN: 0026-461X</identifier><identifier>EISSN: 1471-8022</identifier><identifier>DOI: 10.1180/mgm.2020.64</identifier><language>eng</language><publisher>London: Mineralogical Society</publisher><subject>allanite ; ancylite ; bastnaesite ; britholite ; britholite group ; carbonates ; cerium ; chemical composition ; coexisting minerals ; Commonwealth of Independent States ; crystal structure ; Economic geology ; electron probe data ; epidote group ; fluorides ; formula ; halides ; lanthanum ; lattice parameters ; metal ores ; metals ; mineral composition ; Mineralogy ; Minerals ; Mochalin Log Deposit ; nesosilicates ; new minerals ; orthosilicates ; phosphates ; Quartz ; radekskodaite ; rare earth deposits ; rare earths ; Russian Federation ; silicates ; Slabs ; sorosilicates ; Southern Urals ; space groups ; Titanium dioxide ; tornebohmite ; Urals ; X-ray diffraction ; X-ray diffraction data</subject><ispartof>Mineralogical magazine, 2020-12, Vol.84 (6), p.839-853</ispartof><rights>GeoRef, Copyright 2021, American Geosciences Institute. Reference includes data from GeoScienceWorld @Alexandria, VA @USA @United States. Abstract, Copyright, Mineralogical Society of Great Britain and Ireland</rights><rights>Copyright © The Author(s), 2020. Published by Cambridge University Press on behalf of The Mineralogical Society of Great Britain and Ireland</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,780,784,27923,27924</link.rule.ids></links><search><creatorcontrib>Kasatkin, Anatoly V</creatorcontrib><creatorcontrib>Zubkova, Natalia V</creatorcontrib><creatorcontrib>Pekov, Igor V</creatorcontrib><creatorcontrib>Chukanov, Nikita V</creatorcontrib><creatorcontrib>Ksenofontov, Dmitriy A</creatorcontrib><creatorcontrib>Agakhanov, Atali A</creatorcontrib><creatorcontrib>Belakovskiy, Dmitriy I</creatorcontrib><creatorcontrib>Polekhovsky, Yury S</creatorcontrib><creatorcontrib>Kuznetsov, Aleksey M</creatorcontrib><creatorcontrib>Britvin, Sergey N</creatorcontrib><creatorcontrib>Pushcharovsky, Dmitry Yu</creatorcontrib><creatorcontrib>Nestola, Fabrizio</creatorcontrib><title>The mineralogy of the historical Mochalin Log REE deposit, South Urals, Russia; Part II, Radekskodaite-(La), (CaLa5)(Al4Fe2+)[Si2O7][SiO4]5O(OH)3 and radekskodaite-(Ce), (CaCe5)(Al4Fe2+)[Si2O7][SiO4]5O(OH)3, two new minerals with a novel structure-type belonging to the epidote-törnebohmite polysomatic series</title><title>Mineralogical magazine</title><description>Two new isostructural minerals radekskodaite-(La) (CaLa5)(Al4Fe2+)[Si2O7][SiO4]5O(OH)3 and radekskodaite-(Ce) (CaCe5)(Al4Fe2+)[Si2O7][SiO4]5O(OH)3 were discovered in polymineralic nodules from the Mochalin Log REE deposit, South Urals, Russia. Radekskodaite-(La) is associated with allanite-(Ce), allanite-(La), bastnasite-(Ce), bastnasite-(La), ferriallanite-(Ce), ferriallanite-(La), ferriperboeite-(La), fluorbritholite-(Ce), tornebohmite-(Ce) and tornebohmite-(La). Radekskodaite-(Ce) is associated with ancylite-(Ce), bastnasite-(Ce), bastnasite-(La), lanthanite-(La), perboeite-(Ce) and tornebohmite-(Ce). The new minerals form isolated anhedral grains up to 0.35×0.75 mm [radekskodaite-(La)] and 1 mm ×2 mm [radekskodaite-(Ce)]. Both minerals are greenish-brown with vitreous lustre. Dcalc=4.644 [radekskodaite-(La)] and 4.651 [radekskodaite-(Ce)] g cm-3. Both minerals are optically biaxial (+); radekskodaite-(La): α=1.790(7), β=1.798(5), γ=1.825(8) and 2Vmeas=60(10)°; radekskodaite-(Ce): α=1.798(6), β=1.806(6), γ=1.833(8) and 2Vmeas=65(10)°. Chemical data [wt.%, electron-microprobe; FeO:Fe2O3 by charge balance; H2O by stochiometry; radekskodaite-(La)/radekskodaite-(Ce)] are: CaO 3.40/2.74, La2O3 27.68/22.23, Ce2O3 20.39/24.30, Pr2O3 0.94/1.48, Nd2O3 1.71/3.18, ThO2 0.23/0.24, MgO 0.85/1.04, Al2O3 10.35/10.84, MnO 0.64/0.69, FeO 2.55/2.76, Fe2O3 3.12/2.57, TiO2 0.13/0.04, SiO2 26.03/26.10, F 0.10/0.09, H2O 1.62/1.63, -O=F -0.04/-0.04, total 99.70/99.89. The empirical formulae based on O28(OH,F)3 are: radekskodaite-(La): (Ca0.98Th0.01La2.75Ce2.01Nd0.16Pr0.09)Σ6.00 (Al3.28Fe3+0.63Fe2+0.57Mg0.34Mn0.15Ti0.03)Σ5.00 Si7.00O28[(OH)2.91F0.09]; radekskodaite-(Ce): (Ca0.79Mn0.16Th0.01Ce2.39La2.20Nd0.30Pr0.14)Σ5.99 (Al3.43Fe2+0.62Fe3+0.52Mg0.42Ti0.01)Σ5.00 Si7.00O28[(OH)2.92F0.08]. Both minerals are monoclinic, P21/m; the unit-cell parameters [radekskodaite-(La)/radekskodaite-(Ce)] are: a=8.9604(3)/8.9702(4), b=5.7268(2)/5.7044(2), c=25.1128(10)/25.1642(13) Å, β=116.627(5)/116.766(6)°, V=1151.98(7)/1149.68(11) Å3 and Z=2/2. The crystal structures are solved based on single-crystal X-ray diffraction data; R=0.0554 [radekskodaite-(La)] and 0.0769 [radekskodaite-(Ce)]. Both minerals belong to the epidote-tornebohmite polysomatic series and represent first members of ET2-type: their structure consists of regular alternating modules, one slab of the epidote (E) structure and two slabs of tornebohmite (T). The rootname radekskodaite is given in honor of the Czech mineralogist Radek Skoda (born 1979), Associate Professor at Masaryk University, Brno, Czech Republic. The suffix-modifier -(La) or -(Ce) indicates the predominance of La or Ce among REE in the mineral.</description><subject>allanite</subject><subject>ancylite</subject><subject>bastnaesite</subject><subject>britholite</subject><subject>britholite group</subject><subject>carbonates</subject><subject>cerium</subject><subject>chemical composition</subject><subject>coexisting minerals</subject><subject>Commonwealth of Independent States</subject><subject>crystal structure</subject><subject>Economic geology</subject><subject>electron probe data</subject><subject>epidote group</subject><subject>fluorides</subject><subject>formula</subject><subject>halides</subject><subject>lanthanum</subject><subject>lattice parameters</subject><subject>metal ores</subject><subject>metals</subject><subject>mineral composition</subject><subject>Mineralogy</subject><subject>Minerals</subject><subject>Mochalin Log Deposit</subject><subject>nesosilicates</subject><subject>new minerals</subject><subject>orthosilicates</subject><subject>phosphates</subject><subject>Quartz</subject><subject>radekskodaite</subject><subject>rare earth deposits</subject><subject>rare earths</subject><subject>Russian Federation</subject><subject>silicates</subject><subject>Slabs</subject><subject>sorosilicates</subject><subject>Southern Urals</subject><subject>space groups</subject><subject>Titanium dioxide</subject><subject>tornebohmite</subject><subject>Urals</subject><subject>X-ray diffraction</subject><subject>X-ray diffraction data</subject><issn>0026-461X</issn><issn>1471-8022</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2020</creationdate><recordtype>article</recordtype><sourceid>8G5</sourceid><sourceid>ABUWG</sourceid><sourceid>AFKRA</sourceid><sourceid>AZQEC</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><sourceid>GNUQQ</sourceid><sourceid>GUQSH</sourceid><sourceid>M2O</sourceid><recordid>eNqFj1Fr1EAUhaMouFaf_AMXfNmlm3VmMkk29KmErV2IRNoVBCnLZHKTTJtk4szEZf9Y_0D_mMFV0CefLhzOd849nveOkhWla_Khq7sVI4ysIv7cm1EeU39NGHvhzQhhkc8j-vWV99rae0IopyGbPYt2DUKnejSi1fURdAVuUhplnTZKihY-admIVvWQ6RpuNhsocdBWuSXc6tE18GUi7RJuRmuVuIDPwjjYbidBlPhgH3QplEN_nonFEuapyES4mF-2_ArZ-eLbrWJ5fDednN-F-Ty_XgQg-hLMv3CKJzjF_8BLcAcNPR7-bLJwUNOTAnr9A1uwzozSjQZ9dxwQCmx1X6u-Bqd_7cZBlXpqdE-PpsdCN93UD4Nuj1Z3wikJFo1C-8Z7WU3h-Pb3PfN2V5tdeu1n-cdtepn5dcQjXwpSSeQ8DqqIJXEYR5IEnMQoi6oqRFgkQUICyUkRkIpQyWlcBhQlEpkEmKyDM-_9KXYw-vuI1u3v9Wj6qXHPeByHCeXraHKdn1w1aisV9hIP2rTlX2bC6J7QJObr4CfSdqrb</recordid><startdate>202012</startdate><enddate>202012</enddate><creator>Kasatkin, Anatoly V</creator><creator>Zubkova, Natalia V</creator><creator>Pekov, Igor V</creator><creator>Chukanov, Nikita V</creator><creator>Ksenofontov, Dmitriy A</creator><creator>Agakhanov, Atali A</creator><creator>Belakovskiy, Dmitriy I</creator><creator>Polekhovsky, Yury S</creator><creator>Kuznetsov, Aleksey M</creator><creator>Britvin, Sergey N</creator><creator>Pushcharovsky, Dmitry Yu</creator><creator>Nestola, Fabrizio</creator><general>Mineralogical Society</general><general>Cambridge University Press</general><scope>3V.</scope><scope>7RQ</scope><scope>7XB</scope><scope>8FK</scope><scope>8G5</scope><scope>ABUWG</scope><scope>AEUYN</scope><scope>AFKRA</scope><scope>AZQEC</scope><scope>BENPR</scope><scope>BHPHI</scope><scope>BKSAR</scope><scope>CCPQU</scope><scope>DWQXO</scope><scope>GNUQQ</scope><scope>GUQSH</scope><scope>HCIFZ</scope><scope>M2O</scope><scope>MBDVC</scope><scope>PCBAR</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>Q9U</scope><scope>U9A</scope></search><sort><creationdate>202012</creationdate><title>The mineralogy of the historical Mochalin Log REE deposit, South Urals, Russia; Part II, Radekskodaite-(La), (CaLa5)(Al4Fe2+)[Si2O7][SiO4]5O(OH)3 and radekskodaite-(Ce), (CaCe5)(Al4Fe2+)[Si2O7][SiO4]5O(OH)3, two new minerals with a novel structure-type belonging to the epidote-törnebohmite polysomatic series</title><author>Kasatkin, Anatoly V ; Zubkova, Natalia V ; Pekov, Igor V ; Chukanov, Nikita V ; Ksenofontov, Dmitriy A ; Agakhanov, Atali A ; Belakovskiy, Dmitriy I ; Polekhovsky, Yury S ; Kuznetsov, Aleksey M ; Britvin, Sergey N ; Pushcharovsky, Dmitry Yu ; Nestola, Fabrizio</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-g646-ca0fce4473f6297576c03407ecbffba5b93903c40b30f01c417d31ece0c93e983</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2020</creationdate><topic>allanite</topic><topic>ancylite</topic><topic>bastnaesite</topic><topic>britholite</topic><topic>britholite group</topic><topic>carbonates</topic><topic>cerium</topic><topic>chemical composition</topic><topic>coexisting minerals</topic><topic>Commonwealth of Independent States</topic><topic>crystal structure</topic><topic>Economic geology</topic><topic>electron probe data</topic><topic>epidote group</topic><topic>fluorides</topic><topic>formula</topic><topic>halides</topic><topic>lanthanum</topic><topic>lattice parameters</topic><topic>metal ores</topic><topic>metals</topic><topic>mineral composition</topic><topic>Mineralogy</topic><topic>Minerals</topic><topic>Mochalin Log Deposit</topic><topic>nesosilicates</topic><topic>new minerals</topic><topic>orthosilicates</topic><topic>phosphates</topic><topic>Quartz</topic><topic>radekskodaite</topic><topic>rare earth deposits</topic><topic>rare earths</topic><topic>Russian Federation</topic><topic>silicates</topic><topic>Slabs</topic><topic>sorosilicates</topic><topic>Southern Urals</topic><topic>space groups</topic><topic>Titanium dioxide</topic><topic>tornebohmite</topic><topic>Urals</topic><topic>X-ray diffraction</topic><topic>X-ray diffraction data</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Kasatkin, Anatoly V</creatorcontrib><creatorcontrib>Zubkova, Natalia V</creatorcontrib><creatorcontrib>Pekov, Igor V</creatorcontrib><creatorcontrib>Chukanov, Nikita V</creatorcontrib><creatorcontrib>Ksenofontov, Dmitriy A</creatorcontrib><creatorcontrib>Agakhanov, Atali A</creatorcontrib><creatorcontrib>Belakovskiy, Dmitriy I</creatorcontrib><creatorcontrib>Polekhovsky, Yury S</creatorcontrib><creatorcontrib>Kuznetsov, Aleksey M</creatorcontrib><creatorcontrib>Britvin, Sergey N</creatorcontrib><creatorcontrib>Pushcharovsky, Dmitry Yu</creatorcontrib><creatorcontrib>Nestola, Fabrizio</creatorcontrib><collection>ProQuest Central (Corporate)</collection><collection>Career & Technical Education Database</collection><collection>ProQuest Central (purchase pre-March 2016)</collection><collection>ProQuest Central (Alumni) (purchase pre-March 2016)</collection><collection>Research Library (Alumni Edition)</collection><collection>ProQuest Central (Alumni Edition)</collection><collection>ProQuest One Sustainability</collection><collection>ProQuest Central UK/Ireland</collection><collection>ProQuest Central Essentials</collection><collection>ProQuest Central</collection><collection>Natural Science Collection</collection><collection>Earth, Atmospheric & Aquatic Science Collection</collection><collection>ProQuest One Community College</collection><collection>ProQuest Central Korea</collection><collection>ProQuest Central Student</collection><collection>Research Library Prep</collection><collection>SciTech Premium Collection</collection><collection>Research Library</collection><collection>Research Library (Corporate)</collection><collection>Earth, Atmospheric & Aquatic Science Database</collection><collection>ProQuest One Academic Eastern Edition (DO NOT USE)</collection><collection>ProQuest One Academic</collection><collection>ProQuest One Academic UKI Edition</collection><collection>ProQuest Central Basic</collection><jtitle>Mineralogical magazine</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Kasatkin, Anatoly V</au><au>Zubkova, Natalia V</au><au>Pekov, Igor V</au><au>Chukanov, Nikita V</au><au>Ksenofontov, Dmitriy A</au><au>Agakhanov, Atali A</au><au>Belakovskiy, Dmitriy I</au><au>Polekhovsky, Yury S</au><au>Kuznetsov, Aleksey M</au><au>Britvin, Sergey N</au><au>Pushcharovsky, Dmitry Yu</au><au>Nestola, Fabrizio</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>The mineralogy of the historical Mochalin Log REE deposit, South Urals, Russia; Part II, Radekskodaite-(La), (CaLa5)(Al4Fe2+)[Si2O7][SiO4]5O(OH)3 and radekskodaite-(Ce), (CaCe5)(Al4Fe2+)[Si2O7][SiO4]5O(OH)3, two new minerals with a novel structure-type belonging to the epidote-törnebohmite polysomatic series</atitle><jtitle>Mineralogical magazine</jtitle><date>2020-12</date><risdate>2020</risdate><volume>84</volume><issue>6</issue><spage>839</spage><epage>853</epage><pages>839-853</pages><issn>0026-461X</issn><eissn>1471-8022</eissn><abstract>Two new isostructural minerals radekskodaite-(La) (CaLa5)(Al4Fe2+)[Si2O7][SiO4]5O(OH)3 and radekskodaite-(Ce) (CaCe5)(Al4Fe2+)[Si2O7][SiO4]5O(OH)3 were discovered in polymineralic nodules from the Mochalin Log REE deposit, South Urals, Russia. Radekskodaite-(La) is associated with allanite-(Ce), allanite-(La), bastnasite-(Ce), bastnasite-(La), ferriallanite-(Ce), ferriallanite-(La), ferriperboeite-(La), fluorbritholite-(Ce), tornebohmite-(Ce) and tornebohmite-(La). Radekskodaite-(Ce) is associated with ancylite-(Ce), bastnasite-(Ce), bastnasite-(La), lanthanite-(La), perboeite-(Ce) and tornebohmite-(Ce). The new minerals form isolated anhedral grains up to 0.35×0.75 mm [radekskodaite-(La)] and 1 mm ×2 mm [radekskodaite-(Ce)]. Both minerals are greenish-brown with vitreous lustre. Dcalc=4.644 [radekskodaite-(La)] and 4.651 [radekskodaite-(Ce)] g cm-3. Both minerals are optically biaxial (+); radekskodaite-(La): α=1.790(7), β=1.798(5), γ=1.825(8) and 2Vmeas=60(10)°; radekskodaite-(Ce): α=1.798(6), β=1.806(6), γ=1.833(8) and 2Vmeas=65(10)°. Chemical data [wt.%, electron-microprobe; FeO:Fe2O3 by charge balance; H2O by stochiometry; radekskodaite-(La)/radekskodaite-(Ce)] are: CaO 3.40/2.74, La2O3 27.68/22.23, Ce2O3 20.39/24.30, Pr2O3 0.94/1.48, Nd2O3 1.71/3.18, ThO2 0.23/0.24, MgO 0.85/1.04, Al2O3 10.35/10.84, MnO 0.64/0.69, FeO 2.55/2.76, Fe2O3 3.12/2.57, TiO2 0.13/0.04, SiO2 26.03/26.10, F 0.10/0.09, H2O 1.62/1.63, -O=F -0.04/-0.04, total 99.70/99.89. The empirical formulae based on O28(OH,F)3 are: radekskodaite-(La): (Ca0.98Th0.01La2.75Ce2.01Nd0.16Pr0.09)Σ6.00 (Al3.28Fe3+0.63Fe2+0.57Mg0.34Mn0.15Ti0.03)Σ5.00 Si7.00O28[(OH)2.91F0.09]; radekskodaite-(Ce): (Ca0.79Mn0.16Th0.01Ce2.39La2.20Nd0.30Pr0.14)Σ5.99 (Al3.43Fe2+0.62Fe3+0.52Mg0.42Ti0.01)Σ5.00 Si7.00O28[(OH)2.92F0.08]. Both minerals are monoclinic, P21/m; the unit-cell parameters [radekskodaite-(La)/radekskodaite-(Ce)] are: a=8.9604(3)/8.9702(4), b=5.7268(2)/5.7044(2), c=25.1128(10)/25.1642(13) Å, β=116.627(5)/116.766(6)°, V=1151.98(7)/1149.68(11) Å3 and Z=2/2. The crystal structures are solved based on single-crystal X-ray diffraction data; R=0.0554 [radekskodaite-(La)] and 0.0769 [radekskodaite-(Ce)]. Both minerals belong to the epidote-tornebohmite polysomatic series and represent first members of ET2-type: their structure consists of regular alternating modules, one slab of the epidote (E) structure and two slabs of tornebohmite (T). The rootname radekskodaite is given in honor of the Czech mineralogist Radek Skoda (born 1979), Associate Professor at Masaryk University, Brno, Czech Republic. The suffix-modifier -(La) or -(Ce) indicates the predominance of La or Ce among REE in the mineral.</abstract><cop>London</cop><pub>Mineralogical Society</pub><doi>10.1180/mgm.2020.64</doi><tpages>15</tpages></addata></record> |
| fulltext | fulltext |
| identifier | ISSN: 0026-461X |
| ispartof | Mineralogical magazine, 2020-12, Vol.84 (6), p.839-853 |
| issn | 0026-461X 1471-8022 |
| language | eng |
| recordid | cdi_proquest_journals_2477591486 |
| source | Cambridge University Press Journals Complete |
| subjects | allanite ancylite bastnaesite britholite britholite group carbonates cerium chemical composition coexisting minerals Commonwealth of Independent States crystal structure Economic geology electron probe data epidote group fluorides formula halides lanthanum lattice parameters metal ores metals mineral composition Mineralogy Minerals Mochalin Log Deposit nesosilicates new minerals orthosilicates phosphates Quartz radekskodaite rare earth deposits rare earths Russian Federation silicates Slabs sorosilicates Southern Urals space groups Titanium dioxide tornebohmite Urals X-ray diffraction X-ray diffraction data |
| title | The mineralogy of the historical Mochalin Log REE deposit, South Urals, Russia; Part II, Radekskodaite-(La), (CaLa5)(Al4Fe2+)[Si2O7][SiO4]5O(OH)3 and radekskodaite-(Ce), (CaCe5)(Al4Fe2+)[Si2O7][SiO4]5O(OH)3, two new minerals with a novel structure-type belonging to the epidote-törnebohmite polysomatic series |
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