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Pyrochlore-Supergroup Minerals Nomenclature: An Update
1Instituto de Geociências - Universidade de São Paulo, São Paulo, Brazil.
Frontiers in Chemistry
|September 23, 2021
Summary
The pyrochlore supergroup now includes 31 mineral species, with 24 new discoveries since 2010. This mineral group features diverse crystal structures and compositions, expanding our understanding of mineralogy.
Area of Science:
- Mineralogy
- Crystallography
- Geochemistry
Background:
- The pyrochlore supergroup follows the general formula A2B2X6Y.
- Mineral nomenclature is based on prefixes indicating site dominance and a root name.
- Thirty-one species are currently recognized, categorized into four main groups and two unassigned members.
Purpose of the Study:
- To detail the nomenclature and classification of the pyrochlore supergroup minerals.
- To highlight the expansion of the pyrochlore supergroup with new species descriptions.
- To provide an overview of the structural diversity within the supergroup.
Main Methods:
- Nomenclature system analysis.
- Review of mineral species descriptions and classifications.
- Analysis of crystallographic data (crystal system, space group, polytypes).
Main Results:
- The pyrochlore supergroup comprises 31 species, with 24 described between 2010 and 2021.
- Initial nomenclature in 2010 recognized seven species, all cubic with space group Fd-3m.
- New species exhibit varied crystallographic properties, including different space groups (e.g., P4232) and polytypes (e.g., 3C, 6R, 3R).
Conclusions:
- The pyrochlore supergroup has significantly expanded since 2010, reflecting ongoing mineralogical research.
- Structural diversity, including polytypism and different space groups, is a key feature of this mineral group.
- Further discoveries of pyrochlore-supergroup minerals are anticipated.
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