First crystal structure description of allanite-(Y) from the type locality Åskagen, Värmland, Sweden: EPMA, Mössbauer, Raman and SC-XRD data

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15640%2F25%3A73632518" target="_blank" >RIV/61989592:15640/25:73632518 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216224:14310/25:00140882

Výsledek na webu

<a href="https://www.cambridge.org/core/journals/mineralogical-magazine/article/first-crystal-structure-description-of-allanitey-from-the-type-locality-askagen-varmland-sweden-epma-mossbauer-raman-and-scxrd-data/206F6FE842251FDAB68DCC3A60ED151F" target="_blank" >https://www.cambridge.org/core/journals/mineralogical-magazine/article/first-crystal-structure-description-of-allanitey-from-the-type-locality-askagen-varmland-sweden-epma-mossbauer-raman-and-scxrd-data/206F6FE842251FDAB68DCC3A60ED151F</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1180/mgm.2025.20" target="_blank" >10.1180/mgm.2025.20</a>

Jazyk výsledku

angličtina

Název v původním jazyce

First crystal structure description of allanite-(Y) from the type locality Åskagen, Värmland, Sweden: EPMA, Mössbauer, Raman and SC-XRD data

Popis výsledku v původním jazyce

Allanite-(Y), ideally CaY(Al2Fe2+)(Si2O7)(SiO4)O(OH), is a valid species with the type locality in the &amp; Aring;skagen pegmatite, V &amp; auml;rmland, Sweden. The mineral occurs as an accessory phase in the blocky zone of the NYF granitic pegmatite near &amp; Aring;skagen, V &amp; auml;rmland, Sweden. It forms rims together with iimoriite-(Y), gadolinite-(Y) and allanite-(Nd) around altered crystals of thal &amp; eacute;nite-(Y). Allanite-(Y) replaced primary thal &amp; eacute;nite-(Y) during an episode of early post-magmatic hydrothermal activity. Allanite-(Y) forms euhedral crystals with size up to 1 mm, black with a vitreous lustre, conchoidal fracture and greyish brown streak. It has a Mohs hardness of ca. 6, the calculated density of 3.945 g.cm-3 and is biaxial (-) with alpha = 1.760(3), beta = 1.799(2) and gamma = 1.784(3) in 589 nm light; pleochroism is weak pale yellowish brown in all directions. Allanite-(Y) has monoclinic symmetry, with the space group P21/m, a = 8.8520(8) &amp; Aring;, b = 5.6959(5) &amp; Aring;, c = 10.0543(9) &amp; Aring;, beta = 115.510(2)degrees, V = 457.52(7) &amp; Aring;3 and Z = 2. Crystal-chemical analysis resulted in the empirical formula: A1(Ca0.900Mn0.090Na0.010)Sigma 1.000A2(Y0.323Ca0.260Nd0.118Sm0.087Gd0.098Dy0.044Ce0.034Pr0.014Tb0.012Er0.005La0.003Ho0.002Yb0.001)Sigma 1.001M1(Al0.921Fe2+0.070Ti0.003)Sigma 0.994M2(Al1.000)M3(Fe2+0.638Fe3+0.262Al0.072Mg0.028)Sigma 1.000T1(Si1.000)T2(Si1.000)T3(Si1.003)O12.000(OH)1.000.Allanite-(Y) belongs to the allanite group of the epidote supergroup. The closest end-member compositions of valid allanite group species are allanite-(Ce), allanite-(La) and allanite-(Nd) related via the simple exchange mechanism Y &lt;-&gt; Ln. The allanite-(Y) origin during metasomatic replacement of the thal &amp; eacute;nite-(Y) was mainly affected by local system composition and structural constraints rather than Ln+Y fluoride complexation in hydrothermal solution.

Název v anglickém jazyce

First crystal structure description of allanite-(Y) from the type locality Åskagen, Värmland, Sweden: EPMA, Mössbauer, Raman and SC-XRD data

Popis výsledku anglicky

Allanite-(Y), ideally CaY(Al2Fe2+)(Si2O7)(SiO4)O(OH), is a valid species with the type locality in the &amp; Aring;skagen pegmatite, V &amp; auml;rmland, Sweden. The mineral occurs as an accessory phase in the blocky zone of the NYF granitic pegmatite near &amp; Aring;skagen, V &amp; auml;rmland, Sweden. It forms rims together with iimoriite-(Y), gadolinite-(Y) and allanite-(Nd) around altered crystals of thal &amp; eacute;nite-(Y). Allanite-(Y) replaced primary thal &amp; eacute;nite-(Y) during an episode of early post-magmatic hydrothermal activity. Allanite-(Y) forms euhedral crystals with size up to 1 mm, black with a vitreous lustre, conchoidal fracture and greyish brown streak. It has a Mohs hardness of ca. 6, the calculated density of 3.945 g.cm-3 and is biaxial (-) with alpha = 1.760(3), beta = 1.799(2) and gamma = 1.784(3) in 589 nm light; pleochroism is weak pale yellowish brown in all directions. Allanite-(Y) has monoclinic symmetry, with the space group P21/m, a = 8.8520(8) &amp; Aring;, b = 5.6959(5) &amp; Aring;, c = 10.0543(9) &amp; Aring;, beta = 115.510(2)degrees, V = 457.52(7) &amp; Aring;3 and Z = 2. Crystal-chemical analysis resulted in the empirical formula: A1(Ca0.900Mn0.090Na0.010)Sigma 1.000A2(Y0.323Ca0.260Nd0.118Sm0.087Gd0.098Dy0.044Ce0.034Pr0.014Tb0.012Er0.005La0.003Ho0.002Yb0.001)Sigma 1.001M1(Al0.921Fe2+0.070Ti0.003)Sigma 0.994M2(Al1.000)M3(Fe2+0.638Fe3+0.262Al0.072Mg0.028)Sigma 1.000T1(Si1.000)T2(Si1.000)T3(Si1.003)O12.000(OH)1.000.Allanite-(Y) belongs to the allanite group of the epidote supergroup. The closest end-member compositions of valid allanite group species are allanite-(Ce), allanite-(La) and allanite-(Nd) related via the simple exchange mechanism Y &lt;-&gt; Ln. The allanite-(Y) origin during metasomatic replacement of the thal &amp; eacute;nite-(Y) was mainly affected by local system composition and structural constraints rather than Ln+Y fluoride complexation in hydrothermal solution.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10504 - Mineralogy

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2025

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

MINERALOGICAL MAGAZINE

ISSN

0026-461X

e-ISSN

1471-8022

Svazek periodika

89

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

11

Strana od-do

172-182

Kód UT WoS článku

001472764200001

EID výsledku v databázi Scopus

2-s2.0-105001201955