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Parisite-(Nd), ideally CaNd2(CO3)3F2, a new mineral from Bayan Obo FeNbREE deposit, Inner Mongolia, China

Published online by Cambridge University Press:  23 December 2024

Chenzi Fan Open the ORCID record for Chenzi Fan [Opens in a new window] ,
Hong Yu ,
Xiangping Gu ,
Pusheng Zeng  and
Zhenyu Chen
Chenzi Fan*
Affiliation:
National Research Centre for Geoanalysis, Beijing, China
Hong Yu
Affiliation:
Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing, China;
Xiangping Gu
Affiliation:
School of Geosciences and Info-Physics, Central South University, Changsha, China
Pusheng Zeng
Affiliation:
National Research Centre for Geoanalysis, Beijing, China
Zhenyu Chen
Affiliation:
Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing, China;
*
Corresponding author: Chenzi Fan; Email: czfan2013@163.com
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Abstract

Parisite-(Nd) (IMA2024-013), ideally CaNd2(CO3)3F2, as the Nd-dominant analogue of parisite-(Ce), occurs in dolomitic marble in the Bayan Obo Fe–Nb–REE deposit, Inner Mongolia, China. It is associated with calcite, aegirine, magnetite, hematite, fluorite, riebeckite, bastnäsite-(Ce), baryte, aeschynite-(Ce), aeschynite-(Nd), monazite and parisite-(Ce). Parisite-(Nd) occurs as subhedral to anhedral irregular grains from 0.02 mm to 1 mm. Parisite-(Nd) is transparent, yellowish-brown colour, with pale yellow streak and displays vitreous to resinous lustre. Cleavage is distinct on pseudo-{001}; fracture is uneven, or conchoidal. The Mohs hardness is 4 to 5, and it is brittle. The calculated density of parisite-(Nd) is 4.357 g/cm3. Parisite-(Nd) is pseudo-uniaxial (+), ω = (1.679) and ε = (1.754). The empirical formula is (Ca0.945Fe0.058Sr0.015Ba0.007)Σ1.025(Nd0.967Ce0.529La0.191Pr0.137Gd0.070Sm0.029Th0.022Y0.016Nb0.011Ho0.003)Σ1.975(CO3)3F1.893OH0.023. The Raman spectra of parisite-(Nd) show strong and sharp peaks at 1113, 1090, 825, 635 and 1608 cm–1 and moderate to weak bands centred at 255, 392, 739, 924, 1183, 1228, 1296, 1640, 2247, 2924 and 3065 cm–1. Powder X-ray diffraction and TEM studies give the following results: monoclinic, space group: Cc (# 9), a = 12.3283(13) Å, b = 7.1185(4) Å, c = 28.4633(37) Å, β = 98.529(14)°, V = 2470.28(42) Å3 and Z = 12.

Keywords

parisite-(Nd)new mineralCa-REE fluorocarbonateBayan Obo depositInner MongoliaChina

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Article
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Mineralogical Magazine , First View , pp. 1 - 10
Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of The Mineralogical Society of the United Kingdom and Ireland.

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Footnotes

Associate Editor: Mihoko Hoshino

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