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Nomenclature of the ancylite supergroup

Part of: Alessandro Guastoni memorial issue

Published online by Cambridge University Press:  19 February 2024

Yanjuan Wang Open the ORCID record for Yanjuan Wang [Opens in a new window] ,
Fabrizio Nestola Open the ORCID record for Fabrizio Nestola [Opens in a new window] ,
Zengqian Hou ,
Ritsuro Miyawaki ,
Igor V. Pekov ,
Xiangping Gu Open the ORCID record for Xiangping Gu [Opens in a new window] ,
Guochen Dong  and
Kai Qu Open the ORCID record for Kai Qu [Opens in a new window]
Yanjuan Wang*
Affiliation:
School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China Department of Geosciences, University of Padova, Padova 35131, Italy
Fabrizio Nestola
Affiliation:
Department of Geosciences, University of Padova, Padova 35131, Italy
Zengqian Hou
Affiliation:
School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China
Ritsuro Miyawaki
Affiliation:
Department of Geology, National Museum of Nature and Science, 4-1-1 Amakubo, Tsukuba 305-0005, Japan
Igor V. Pekov
Affiliation:
Faculty of Geology, Moscow State University, Vorobievy Gory, Moscow 119991, Russia
Xiangping Gu
Affiliation:
School of Geosciences and Info-Physics, Central South University, Changsha 410083, Hunan, China
Guochen Dong
Affiliation:
School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China
Kai Qu
Affiliation:
Tianjin Center, China Geological Survey, Tianjin 300170, China School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, China
*
Corresponding author: Yanjuan Wang; Email: [email protected]
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Abstract

The ancylite supergroup has been approved by the Commission on New Minerals, Nomenclature and Classification of the International Mineralogical Association, with the general crystal chemical formula (M3+xM2+2–x)(CO3)2[(OH)x⋅(2–x)H2O] (1 ≤ x ≤ 2, Z = 2). The ancylite supergroup can be divided into two groups defined by different proportions of the M cation and hydroxyl anion and/or water molecule: the ancylite group is defined for 1 ≤ x ≤ 1.5; the kozoite group is defined for 1.5 < x ≤ 2. The ancylite supergroup minerals are orthorhombic with space group Pmcn, or monoclinic with space group Pm11, and have a crystal structure with species-defining trivalent and divalent M cations (M = La3+, Ce3+, Nd3+, Ca2+, Sr2+ and Pb2+) which centre ten-vertex polyhedra formed by oxygen atoms at three independent O sites. Two vertices of the triangular (CO3)2– anion are oxygen atoms, whereas the third one, O(3), is statistically filled with (OH)– groups and H2O molecules. The triangular faces of three oxygen atoms of MO10 coordination polyhedra join the chains of this ten-vertex polyhedron, which is extended along the c axis. The (CO3) triangles connect chains in three dimensions. To date, eight valid mineral species with M2+ = Sr2+, Ca2+ and Pb2+ belong to the ancylite group [ancylite-(La), ancylite-(Ce), calcioancylite-(La), calcioancylite-(Ce), calcioancylite-(Nd), gysinite-(La), gysinite-(Ce) and gysinite-(Nd)]. Two hydroxyl carbonates with only rare earth elements as species-defining cations, kozoite-(La) and kozoite-(Nd) are members of the kozoite group.

Keywords

ancylite supergroupancylitecalcioancylitegysinitekozoitenomenclatureclassification
Type
Article
Information
Mineralogical Magazine , Volume 88 , Issue 6 , December 2024 , pp. 677 - 681
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

This paper is part of a thematic set on pegmatites in memory of Alessandro Guastoni

Guest Editor: Simone Molinari

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