uu.seUppsala University Publications
Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Gadolinite-(Nd), a new member of the gadolinite supergroup from Fe-REE deposits of Bastnäs-type, Sweden
Masaryk Univ, Fac Sci, Dept Geol Sci, Kotlarska 2, CZ-61137 Brno, Czech Republic.
Inst Phys ASCR, Vvi, Slovance 2, CZ-18221 Prague 8, Czech Republic.
Masaryk Univ, Fac Sci, Dept Geol Sci, Kotlarska 2, CZ-61137 Brno, Czech Republic.
Masaryk Univ, Fac Sci, Dept Geol Sci, Kotlarska 2, CZ-61137 Brno, Czech Republic.
Show others and affiliations
2018 (English)In: Mineralogical magazine, ISSN 0026-461X, E-ISSN 1471-8022, Vol. 82, no Suppl. 1, p. S133-S145Article in journal (Refereed) Published
Abstract [en]

A new member of the gadolinite supergroup, gadolinite-(Nd), IMA2016-013, ideally Nd2FeBe2Si2O10, was found in the Malmkarra mine, similar to 3.5km WSW of Norberg, south-central Sweden, where it occurs in association with fluorbritholite-(Ce), vastmanlandite-(Ce), dollaseite-(Ce), bastnasite-(Ce) and tremolite. Gadolinite-(Nd) forms anhedral grains up to 150 mu m in size, commonly occurring as aggregates of olive green colour. The crystals are transparent with vitreous to adamantine lustre. Gadolinite-(Nd) is brittle with conchoidal fracture, no cleavage or parting was observed. It has a white streak, the Mohs hardness is 6.5-7 and the calculated density is 4.86gcm(-3). Optically, the mineral is weakly pleochroic in shades of olive green, biaxial (-), n=1.78(1), n((calc.))=1.80, n=1.81(1) measured in white light, 2V((meas.))=62(3)degrees. Electron-microprobe and laser ablation inductively coupled plasma mass spectrometry analysis [in wt.%] provided SiO2 21.77, Y2O3 5.49, La2O3 2.78, Ce-2 O-3 14.04, Pr2O3 3.28, Nd2O3 19.27, Sm2O3 5.30, Eu2O3 0.24, Gd2O3 4.10, Tb2O3 0.36, Dy2O3 1.32, Ho2O3 0.18, Er2O3 0.38, MgO 0.51, CaO 0.14, MnO 0.10, FeO 10.62, B2O3 0.10, BeOcalc. 8.99, H2Ocalc. 0.55 and total 99.52 giving the following empirical formula (based on 2 Si): (Nd0.632Ce0.472Y0.268Sm0.168Gd0.125Pr0.110La0.094Dy0.039Ca0.014Er0.011Tb0.011Eu0.008Ho0.008)(Sigma 1.957)(Fe0.816Mg0.070Mn0.008)(Sigma 0.894)(Be1.984B0.016)(Sigma 2.000)Si2O9.660OH0.337. A weak Raman vibration band at similar to 3525cm(-1) confirms the presence of water in the structure. Gadolinite-(Nd) is monoclinic, P2(1)/c, with a=4.8216(3) angstrom, b=7.6985(4) angstrom, c=10.1362(6) angstrom, beta =90.234(4)degrees, V=376.24(6) angstrom(3) and Z=2. The strongest X-ray diffraction lines are [d(obs) in angstrom (hkl) I-rel]: 4.830 (100) 72, 3.603 (021) 37, 3.191(-112) 52, 3.097 (013) 35, 2.888 (121) 100, 2.607(113) 49, 2.412 (200) 24. Along with the Malmkarra mine, gadolinite-(Nd) was also recorded also at Johannagruvan and Nya Bastnas. The minerals of the gadolinite subgroup together with fluorbritholite-(Ce) incorporate the highest fraction of medium-to-heavy rare-earth elements among associated rare-earth element minerals in the Malmkarra mine and possibly in all Bastnas-type deposits.

Place, publisher, year, edition, pages
MINERALOGICAL SOC , 2018. Vol. 82, no Suppl. 1, p. S133-S145
Keywords [en]
gadolinite-(Nd), rare-earth elements, new mineral, crystal structure, Malmkarra, Bastnas-type deposits
National Category
Geochemistry
Identifiers
URN: urn:nbn:se:uu:diva-359667DOI: 10.1180/minmag.2017.081.047ISI: 000435650000007OAI: oai:DiVA.org:uu-359667DiVA, id: diva2:1245568
Funder
Swedish Research CouncilThe Geological Survey of Sweden (SGU)Available from: 2018-09-05 Created: 2018-09-05 Last updated: 2018-09-05Bibliographically approved

Open Access in DiVA

fulltext(366 kB)33 downloads
File information
File name FULLTEXT01.pdfFile size 366 kBChecksum SHA-512
6d02a47c8f4094f7e9484e9ecc5570feefd900597571996bb9de309a2620a4f8bd6dcc034e4017ef857661c160af3c0ce0da8ebfbe5383ba77d2d279417fbdff
Type fulltextMimetype application/pdf

Other links

Publisher's full text

Authority records BETA

Jonsson, Erik

Search in DiVA

By author/editor
Jonsson, Erik
By organisation
Mineralogy Petrology and Tectonics
In the same journal
Mineralogical magazine
Geochemistry

Search outside of DiVA

GoogleGoogle Scholar
Total: 33 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 26 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf