Redefinition of thalénite-(Y) and discreditation of
fluorthalénite-(Y): A re-investigation of type material from
the Österby pegmatite, Dalarna, Sweden, and from additional
localities

J 2015

Redefinition of thalénite-(Y) and discreditation of fluorthalénite-(Y): A re-investigation of type material from the Österby pegmatite, Dalarna, Sweden, and from additional localities

ŠKODA, Radek, Jakub PLÁŠIL, Erik JONSSON, Renata ČOPJAKOVÁ, Langhof JÖRGEN et. al.

Základní údaje

Originální název

Redefinition of thalénite-(Y) and discreditation of fluorthalénite-(Y): A re-investigation of type material from the Österby pegmatite, Dalarna, Sweden, and from additional localities

Autoři

ŠKODA, Radek (203 Česká republika, garant, domácí), Jakub PLÁŠIL (203 Česká republika), Erik JONSSON (752 Švédsko), Renata ČOPJAKOVÁ (203 Česká republika, domácí), Langhof JÖRGEN (752 Švédsko) a Michaela VAŠINOVÁ GALIOVÁ (203 Česká republika, domácí)

Vydání

Mineralogical Magazine, Mineralogical Society, 2015, 0026-461X

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10500 1.5. Earth and related environmental sciences

Stát vydavatele

Velká Británie a Severní Irsko

Utajení

není předmětem státního či obchodního tajemství

Impakt faktor

Impact factor: 2.212

Kód RIV

RIV/00216224:14310/15:00081198

Organizační jednotka

Přírodovědecká fakulta

DOI

http://dx.doi.org/10.1180/minmag.2015.079.4.07

UT WoS

000364196000007

Klíčová slova anglicky

thalénite-(Y); fluorthalénite-(Y); fluorine; Y+REE; electron microprobe analysis; single crystal X-ray diffraction; LA-ICP-MS; tetrad effect; Österby; Bergslagen; Sweden

Štítky

AKR, rivok

Příznaky

Mezinárodní význam, Recenzováno

Změněno: 28. 4. 2016 15:05, Ing. Andrea Mikešková

Anotace

V originále

Using type material from the Österby pegmatite in Dalarna, Sweden, the chemical composition and structural parameters of thalénite-(Y) [ideally Y3Si3O10(OH)] were examined by wavelength dispersive spectroscopy electron microprobe (WDS EMP) analysis and single-crystal X-ray diffraction. High contrast back-scatter electron images of the Österby material show at least two generations of thalénite-(Y). The formula of the primary thalénite-(Y) normalized to 11 anions is (Y2.58Dy0.11Yb0.09Gd0.06Er0.06Ho0.02Sm0.02Tb0.02Lu0.02Nd0.01Tm0.01sum3.00Si3.01O10F0.97OH0.03. The secondary thalénite-(Y), replacing the primary material, is weakly enhanced in Y and depleted in the lightest and the heaviest rare-earth elements, yielding the formula (Y2.63Dy0.12Yb0.06Gd0.06Er0.05Ho0.02Sm0.02Tb0.02Tm0.01Nd0.01Lu0.01)sum3.00Si3.01O10F0.98OH0.02. Structural data for thalénite-(Y) from Österby clearly indicate the monoclinic space group P21/n, with a = 7.3464(4), b = 11.1726(5), c = 10.4180(5) Angstoms, beta = 97.318(4)°, V = 848.13(7) cubic Angstoms, Z = 4, which is consistent with previous investigations. The structure was refined from single-crystal X-ray diffraction data to R1 = 0.0371 for 1503 unique observed reflections, and the final chemical composition obtained from the refinement, (Y2.64Dy0.36)sum3.00F0.987[Si3O10], Z = 4, is in good agreement with the empirical formula resulting from electron microprobe (EMP) analysis. Both techniques reveal a strong dominance of F over OH, which means that the type material actually corresponds to the fluorine analogue. Moreover, new EMP analyses of samples of thalénite-(Y) from an additional seven localities (Askagen and Reunavare in Sweden; White Cloud and Snow Flake in Colorado, USA; the Guy Hazel claim in Arizona, USA; Suishoyama and Souri in Japan) clearly show the prevalence of F over OH as well. Based on these observations, the Commission on New Minerals, Nomenclature and Classification of the International Mineralogical Association has recommended a redefinition of the chemical composition of thalénite-(Y) to represent the F-dominant species with the ideal formula Y3Si3O10F, as it has historical priority. Consequently, the later described fluorthalénite-(Y) has to be discredited.

Návaznosti

ED1.1.00/02.0068, projekt VaV

Název: CEITEC - central european institute of technology

GA14-13347S, projekt VaV

Název: Variabilita lehkých prvků (Li, Be, B) ve vybraných horninotvorných a akcesorických minerálech z felsických magmatických a metamorfovaných hornin

Investor: Grantová agentura ČR, Variabilita lehkých prvků (Li, Be, B) ve vybraných horninotvorných a akcesorických minerálech z felsických magmatických a metamorfovaných hornin

Citovat

ŠKODA, Radek, Jakub PLÁŠIL, Erik JONSSON, Renata ČOPJAKOVÁ, Langhof JÖRGEN a Michaela VAŠINOVÁ GALIOVÁ. Redefinition of thalénite-(Y) and discreditation of fluorthalénite-(Y): A re-investigation of type material from the Österby pegmatite, Dalarna, Sweden, and from additional localities. Mineralogical Magazine. Mineralogical Society, 2015, roč. 79, č. 4, s. 965-983. ISSN 0026-461X. Dostupné z: https://dx.doi.org/10.1180/minmag.2015.079.4.07.

@article{1317533,
   author = {Škoda, Radek and Plášil, Jakub and Jonsson, Erik and Čopjaková, Renata and Jörgen, Langhof and Vašinová Galiová, Michaela},
   article_number = {4},
   doi = {http://dx.doi.org/10.1180/minmag.2015.079.4.07},
   keywords = {thalénite-(Y); fluorthalénite-(Y); fluorine; Y+REE; electron microprobe analysis; single crystal X-ray diffraction; LA-ICP-MS; tetrad effect; Österby; Bergslagen; Sweden},
   language = {eng},
   issn = {0026-461X},
   journal = {Mineralogical Magazine},
   title = {Redefinition of thalénite-(Y) and discreditation of fluorthalénite-(Y): A re-investigation of type material from the Österby pegmatite, Dalarna, Sweden, and from additional localities},
   volume = {79},
   year = {2015}
}

TY  - JOUR
ID  - 1317533
AU  - Škoda, Radek - Plášil, Jakub - Jonsson, Erik - Čopjaková, Renata - Jörgen, Langhof - Vašinová Galiová, Michaela
PY  - 2015
TI  - Redefinition of thalénite-(Y) and discreditation of fluorthalénite-(Y): A re-investigation of type material from the Österby pegmatite, Dalarna, Sweden, and from additional localities
JF  - Mineralogical Magazine
VL  - 79
IS  - 4
SP  - 965-983
EP  - 965-983
PB  - Mineralogical Society
SN  - 0026461X
KW  - thalénite-(Y)
KW  - fluorthalénite-(Y)
KW  - fluorine
KW  - Y+REE
KW  - electron microprobe analysis
KW  - single crystal X-ray diffraction
KW  - LA-ICP-MS
KW  - tetrad effect
KW  - Österby
KW  - Bergslagen
KW  - Sweden
N2  - Using type material from the Österby pegmatite in Dalarna, Sweden, the chemical composition and structural parameters of thalénite-(Y) [ideally Y3Si3O10(OH)] were examined by wavelength dispersive spectroscopy electron microprobe (WDS EMP) analysis and single-crystal X-ray diffraction. High contrast back-scatter electron images of the Österby material show at least two generations of thalénite-(Y). The formula of the primary thalénite-(Y) normalized to 11 anions is (Y2.58Dy0.11Yb0.09Gd0.06Er0.06Ho0.02Sm0.02Tb0.02Lu0.02Nd0.01Tm0.01sum3.00Si3.01O10F0.97OH0.03. The secondary thalénite-(Y), replacing the primary material, is weakly enhanced in Y and depleted in the lightest and the heaviest rare-earth elements, yielding the formula (Y2.63Dy0.12Yb0.06Gd0.06Er0.05Ho0.02Sm0.02Tb0.02Tm0.01Nd0.01Lu0.01)sum3.00Si3.01O10F0.98OH0.02. Structural data for thalénite-(Y) from Österby clearly indicate the monoclinic space group P21/n, with a = 7.3464(4), b = 11.1726(5), c = 10.4180(5) Angstoms, beta = 97.318(4)°, V = 848.13(7) cubic Angstoms, Z = 4, which is consistent with previous investigations. The structure was refined from single-crystal X-ray diffraction data to R1 = 0.0371 for 1503 unique observed reflections, and the final chemical composition obtained from the refinement, (Y2.64Dy0.36)sum3.00F0.987[Si3O10], Z = 4, is in good agreement with the empirical formula resulting from electron microprobe (EMP) analysis. Both techniques reveal a strong dominance of F over OH, which means that the type material actually corresponds to the fluorine analogue. Moreover, new EMP analyses of samples of thalénite-(Y) from an additional seven localities (Askagen and Reunavare in Sweden; White Cloud and Snow Flake in Colorado, USA; the Guy Hazel claim in Arizona, USA; Suishoyama and Souri in Japan) clearly show the prevalence of F over OH as well. Based on these observations, the Commission on New Minerals, Nomenclature and Classification of the International Mineralogical Association has recommended a redefinition of the chemical composition of thalénite-(Y) to represent the F-dominant species with the ideal formula Y3Si3O10F, as it has historical priority. Consequently, the later described fluorthalénite-(Y) has to be discredited.
ER  -

ŠKODA, Radek, Jakub PLÁŠIL, Erik JONSSON, Renata ČOPJAKOVÁ, Langhof JÖRGEN a Michaela VAŠINOVÁ GALIOVÁ. Redefinition of thalénite-(Y) and discreditation of fluorthalénite-(Y): A re-investigation of type material from the Österby pegmatite, Dalarna, Sweden, and from additional localities. \textit{Mineralogical Magazine}. Mineralogical Society, 2015, roč.~79, č.~4, s.~965-983. ISSN~0026-461X. Dostupné z: https://dx.doi.org/10.1180/minmag.2015.079.4.07.

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