Mckelveyite group minerals – Part 4: Alicewilsonite-(YLa), Na<sub>2</sub>Sr<sub>2</sub>YLa (CO<sub>3</sub>)<sub>6</sub>&thinsp; ⋅ &thinsp;3H<sub>2</sub>O, a new lanthanum-dominant species from the Paratoo mine, Australia

Abstract 2 Sr2 YLa (CO3) 6  ⋅ 2 O, was found together with kamphaugite-(Y), paratooite-(Y), bastnäsite-(La), and decrespignyite-(Y) coating along fractures in dolomite at the Paratoo copper mine, South Australia, Australia. It occurs as pale pink to colourless pseudohexagonal tabular crystals up to 150 µ m in size. The streak is white; the lustre is vitreous. The mineral has no cleavage. D calc - 3 - α = β =  1.582 (2), γ =  1.592 (2), 2V (meas.) = = 2 O 7.43, CaO 2.00, SrO 18.43, BaO 1.64, Y2 O3 9.59, La2 O3 11.74, Pr2 O3 1.29, Nd2 O3 5.74, Sm2 O3 0.44, Eu2 O3 0.09, Gd2 O3 0.95, Dy2 O3 1.15, Ho2 O3 0.25, Er2 O3 0.89, Yb2 O3 0.29, CO2 29.78, H2 O 6.18, total 97.88. The empirical formula calculated on the basis of six cations with 3 H2 O molecules is as follows: Na2.10 Ca0.31 Sr1.56 Ba0.10 Y0.74 La0.63 Pr0.07 Nd0.30 Sm0.03 Eu0.01 Gd0.04 Dy0.05 Ho0.01 Er0.04 Yb0.01 (CO3) 5.92 (H2 O) 3. The mineral is triclinic, P a =  8.9839 (2), b =  8.9728 (3), c =  6.7441 (2) Å, α =  102.812 (2)°, β =  116.424 (2)°, γ =  60.128 (2)°, and V =  422.17 (2) Å3 and Z =  1. The strongest reflections of the powder X-ray diffraction pattern [d I 1 ‾ 0, 2 ‾ 1 ‾ 1 ‾ 11, 210, 1 ‾ 2 ‾ 2 ‾ 1 ‾ 1 ‾ 1, 121), 2.819 (96)(002, 1 ‾ 12, 211, 1 ‾ 2 ‾ 3 ‾ 01, 030, 3 ‾ 3 ‾ 2 ‾ 21, 4 ‾ 2 ‾ 2 ‾ 4 ‾ 2 ‾ 22, 003, 420, 2 ‾ 4 ‾ 3 ‾ 03, 301, 03 ‾ 2, 032, 3 ‾ 3 ‾ R 1 =  0.058).

Location
Deutsche Nationalbibliothek Frankfurt am Main
Extent
Online-Ressource
Language
Englisch

Bibliographic citation
Mckelveyite group minerals – Part 4: Alicewilsonite-(YLa), Na2Sr2YLa (CO3)6  ⋅  3H2O, a new lanthanum-dominant species from the Paratoo mine, Australia ; volume:36 ; number:2 ; year:2024 ; pages:301-310 ; extent:10
European journal of mineralogy ; 36, Heft 2 (2024), 301-310 (gesamt 10)

Creator
Lykova, Inna
Rowe, Ralph
Poirier, Glenn
Friis, Henrik
Helwig, Kate

DOI
10.5194/ejm-36-301-2024
URN
urn:nbn:de:101:1-2024032803284746637453
Rights
Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.
Last update
14.08.2025, 10:49 AM CEST

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Associated

  • Lykova, Inna
  • Rowe, Ralph
  • Poirier, Glenn
  • Friis, Henrik
  • Helwig, Kate

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