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Håleniusite-(Ce), CeOF, the Ce Analogue of Håleniusite-(La) from the Água de Pau Volcano, Sãn Miguel Island, Azores District, Portugal

Kampf, Anthony R. and Ma, Chi and Chiappino, Luigi (2022) Håleniusite-(Ce), CeOF, the Ce Analogue of Håleniusite-(La) from the Água de Pau Volcano, Sãn Miguel Island, Azores District, Portugal. Canadian Mineralogist, 60 (4). pp. 713-717. ISSN 1499-1276. doi:10.3749/canmin.2200002. https://resolver.caltech.edu/CaltechAUTHORS:20221017-12657600.23

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Abstract

Håleniusite-(Ce) (IMA2021-042), CeOF, is a new mineral discovered in ejectum from the Água de Pau volcano, Sãn Miguel Island, Azores District, Portugal. It occurs as opaque, cream-colored, fine-grained pseudomorphic replacements of hexagonal tablets of bastnäsite-(Ce). It is associated with astrophyllite and fluornatropyrochlore in a matrix composed mainly of albite, quartz, and aegirine. The mineral has a white streak and a calculated density of 5.890 g/cm³ for the empirical formula. The strongest powder diffraction lines are [d_(obs)Å(I_(obs))(hkl)]: 3.247(100)(111), 2.840(31)(200), 2.004(46)(220), and 1.705(42)(311). Electron probe microanalysis provided the empirical formula (Ce₀.₄₁La₀.₂₁Sm₀.₁₅Nd₀.₀₄Eu₀.₀₃Ca₀.₀₂Y₀.₀₂Dy₀.₀₂Gd₀.₀₁)_(Σ0.91)(O₀.₇₀F₀.₃₀)F₁.₀₀. Håleniusite-(Ce) has a fluorite-type structure, space group Fm3̅ m, with a = 5.6597(10) Å and V = 181.29(10) ų (Z = 4).


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.3749/canmin.2200002DOIArticle
ORCID:
AuthorORCID
Kampf, Anthony R.0000-0001-8084-2563
Ma, Chi0000-0002-1828-7033
Additional Information:Reviewers Dan Holtstam and Henrik Friis are thanked for their constructive comments on the manuscript. This study was funded, in part, by the John Jago Trelawney Endowment to the Mineral Sciences Department of the Natural History Museum of Los Angeles County.
Funders:
Funding AgencyGrant Number
John Jago Trelawney EndowmentUNSPECIFIED
Issue or Number:4
DOI:10.3749/canmin.2200002
Record Number:CaltechAUTHORS:20221017-12657600.23
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20221017-12657600.23
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:117462
Collection:CaltechAUTHORS
Deposited By: Research Services Depository
Deposited On:21 Oct 2022 01:27
Last Modified:25 Oct 2022 19:43

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