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dc.date.accessioned2022-04-19T16:35:06Z
dc.date.available2022-04-19T16:35:06Z
dc.date.created2022-03-09T09:20:52Z
dc.date.issued2022
dc.identifier.citationGulbransen, Emil Holtung Friis, Henrik Dal Bo, Fabrice Erambert, Muriel . Illoqite-(Ce), Na2NaBaCeZnSi6O17, a new member of the nordite supergroup from Ilímaussaq alkaline complex, South Greenland. Mineralogical magazine. 2022, 86(1), 141-149
dc.identifier.urihttp://hdl.handle.net/10852/93587
dc.description.abstractAbstract The new mineral, illoqite-(Ce), with the ideal formula Na 2 NaBaCeZnSi 6 O 17 , has been discovered in the Taseq Slope, Ilímaussaq Alkaline Complex, Southern Greenland. Illoqite-(Ce) occurs in a hyperalkaline ussingite vein closely related to one of the largest ussingite veins in the Ilímaussaq complex. The associated minerals are aegirine, arfvedsonite, a britholite-group mineral, epistolite, chkalovite, lueshite, Mn-rich pectolite group member and steenstrupine-(Ce). Illoqite-(Ce) crystallises as either single euhedral crystals up to 150 μm in size or radiating aggregates consisting of a few or many crystals. The aggregates are up to 200 μm in diameter. Illoqite-(Ce) can occur as scattered small groups of crystals or aggregates, but sometimes they occur in high concentrations creating clusters or bands almost completely consisting of illoqite-(Ce). The empirical formula on the basis of 17 anions is Na 2.00 Na 1.00 (Ba 0.59 Sr 0.32 Ca 0.04 Na 0.03 ) Σ0.98 (Ce 0.68 La 0.31 Nd 0.09 Pr 0.04 ) Σ1.12 (Zn 0.42 Fe 0.34 Li 0.14 Mn 0.09 ) Σ0.99 Si 5.97 O 17 , with the simplified formula being Na 2 Na(Ba,Sr)(Ce,La,Nd)(Zn,Fe,Li)Si 6 O 17 . Illoqite-(Ce) exhibits sector zoning between elements Sr and Ba. The crystal structure was determined using single-crystal X-ray diffraction data and refined to R 1 = 2.46% using 1902 unique reflections. Illoqite-(Ce) is orthorhombic, Pcca , with a = 14.5340(7), b = 5.2213(1), c = 19.8270(4) Å, V = 1507.25(6) Å 3 and Z = 4. The strongest lines of the powder X-ray diffraction pattern [ d , Å ( I , %) ( hkl )] are: 7.266 (79) (200), 4.688 (44) (104), 4.241 (64) (210), 3.486 (79) (114), 3.340 (52) (312), 2.986 (67) (410), 2.882 (100) (314) and 2.789 (44) (016). Illoqite-(Ce) is a new member of the nordite supergroup and is named after the Greenlandic word illoq, meaning cousin, in allusion to the mineral's close relation to nordite-(Ce).
dc.languageEN
dc.rightsAttribution 4.0 International
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.titleIlloqite-(Ce), Na2NaBaCeZnSi6O17, a new member of the nordite supergroup from Ilímaussaq alkaline complex, South Greenland
dc.typeJournal article
dc.creator.authorGulbransen, Emil Holtung
dc.creator.authorFriis, Henrik
dc.creator.authorDal Bo, Fabrice
dc.creator.authorErambert, Muriel
cristin.unitcode185,28,8,3
cristin.unitnameMineralogisk forskningsgruppe
cristin.ispublishedtrue
cristin.fulltextoriginal
cristin.qualitycode1
dc.identifier.cristin2008383
dc.identifier.bibliographiccitationinfo:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Mineralogical magazine&rft.volume=86&rft.spage=141&rft.date=2022
dc.identifier.jtitleMineralogical magazine
dc.identifier.volume86
dc.identifier.issue1
dc.identifier.startpage141
dc.identifier.endpage149
dc.identifier.doihttps://doi.org/10.1180/mgm.2021.104
dc.identifier.urnURN:NBN:no-96149
dc.type.documentTidsskriftartikkel
dc.type.peerreviewedPeer reviewed
dc.source.issn0026-461X
dc.identifier.fulltextFulltext https://www.duo.uio.no/bitstream/handle/10852/93587/1/Illoqite-%2528Ce%2529_Gulbransen%2Bet%2Bal%2B2022.pdf
dc.type.versionPublishedVersion


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