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dc.date.accessioned2018-08-12T11:44:48Z
dc.date.available2018-08-12T11:44:48Z
dc.date.created2017-05-14T15:13:58Z
dc.date.issued2017
dc.identifier.citationFriis, Henrik Weller, Mark T. Kampf, Anthony R. . Hansesmarkite, Ca2Mn2Nb6O19·20H2O, a new hexaniobate from a syenite pegmatite in the Larvik Plutonic Complex, southern Norway. Mineralogical magazine. 2017, 81(3), 543-554
dc.identifier.urihttp://hdl.handle.net/10852/62867
dc.description.abstractThe new mineral hansesmarkite (IMA2015-067), Ca2Mn2Nb6O19·20H2O, was discovered at the AS Granit larvikite quarry in Tvedalen, Larvik, Vestfold, Norway. Hansesmarkite forms faintly yellow crystals up to 0.3 mm or thin coatingsin patches on gonnardite. Hansesmarkite is biaxial (+) with refractive indices (white light): α = 1.683(2), β = 1.698(2) and γ = 1.745(3); 2V(meas.) = 60.7(6)° and 2V(calc.) = 60.3°. The mineral exhibits moderate dispersion (r > v)and is pleochroic with X (almost colourless) < Y ( pale yellow) << Z (orangey yellow). The optical orientation is X ^ c = 20°, Y ^ b = 16° and Z ^ a = 5°. The empirical formula based on five electron probemicroanalyses and calculated based on Nb = 6 apfu is (Ca1.93Na0.02K0.01)∑1.96(Mn1.79Fe0.11)∑1.90Nb6O18.84·20H2O, with H2O determined from the structure solution.The mineral is triclinic, P1, with a = 9.081(4), b = 9.982(8), c = 10.60(1) Å, α = 111.07(8), β = 101.15(6), γ = 99.39(5)°, V = 850.8(13) Å3 and Z = 1. The structure was solved at 120 K because of thermalinstability of the mineral and refined to R 1 = 2.50% for F o > 4σ. The strongest reflections in the x-ray diffraction diagram are: [d obs. in Å (I)(hkl)] 9.282(36)(001), 8.610(100)(100, 011), 3.257(30)(031, 131)and 3.058(18)(130, 212). Hansesmarkite is the third naturally occurring hexaniobate in which six edge-sharing Nb-octahedra form the Lindqvist ion. These are linked via Mn-octahedra forming rods along [100] and Ca is located between the rods, creating a three dimensional structure via hydrogen bonds.en_US
dc.languageEN
dc.titleHansesmarkite, Ca2Mn2Nb6O19·20H2O, a new hexaniobate from a syenite pegmatite in the Larvik Plutonic Complex, southern Norwayen_US
dc.typeJournal articleen_US
dc.creator.authorFriis, Henrik
dc.creator.authorWeller, Mark T.
dc.creator.authorKampf, Anthony R.
cristin.unitcode185,28,8,3
cristin.unitnameMineralogisk forskningsgruppe
cristin.ispublishedtrue
cristin.fulltextoriginal
cristin.qualitycode1
dc.identifier.cristin1470106
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=81&rft.spage=543&rft.date=2017
dc.identifier.jtitleMineralogical magazine
dc.identifier.volume81
dc.identifier.issue3
dc.identifier.startpage543
dc.identifier.endpage554
dc.identifier.doihttp://dx.doi.org/10.1180/minmag.2016.080.109
dc.identifier.urnURN:NBN:no-65437
dc.type.documentTidsskriftartikkelen_US
dc.type.peerreviewedPeer reviewed
dc.source.issn0026-461X
dc.identifier.fulltextFulltext https://www.duo.uio.no/bitstream/handle/10852/62867/2/Hansesmarkite_Friis%2Bet%2Bal%2B2017.pdf
dc.type.versionPublishedVersion


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