Published April 2021
| public
Journal Article
Stöfflerite, (Ca,Na)(Si,Al)₄O₈ in the hollandite structure: A new high-pressure polymorph of anorthite from martian meteorite NWA 856
Abstract
We present the crystal structure, composition, and occurrence of stöfflerite, the naturally occurring Ca-aluminosilicate with hollandite-type structure. Stöfflerite is a high-pressure polymorph of anorthite and an approved mineral. The type material was found in the shergottitic martian meteorite Northwest Africa 856. Type stöfflerite (Sto₆₀Lin₄₀) assumes space group I4/m with unit-cell dimensions a = 9.255(1) Å, c = 2.742(3) Å, V = 235.1(2) ų, and Z = 2.
Additional Information
© 2021 Mineralogical Society of America. Manuscript received April 13, 2020; Manuscript accepted August 26, 2020; Manuscript handled by Bin Chen. Part of this work was supported by DE-FG02-94ER14466, DE-NA0001974, NSF Grants EAR-1634415, EAR-1128-799, EAR-1322082. The Advanced Photon Source, a DOE Office of Science User Facility is operated by Argonne National Laboratory under Contract No. DE-AC02-06CH11357. The Advanced Light Source is supported through Contract No. DE-AC02-05CH11231. SEM and EPMA measurements were carried out at the Geological and Planetary Science Division Analytical Facility at Caltech, supported in part by NSF grants EAR-0318518, EAR-1322082, and DMR-0080065. O.T. acknowledges the support from DOE Cooperative Agreement DE-NA0001982. J.G.S. acknowledges support from NSERC Canada, the Canada Foundation for Innovation, and the New Brunswick Innovation Foundation. We thank the reviewers Erin Walton, Martin Kunz, and Ross Angel for their helpful comments.Additional details
- Alternative title
- Stöfflerite, (Ca,Na)(Si,Al)4O8 in the hollandite structure: A new high-pressure polymorph of anorthite from martian meteorite NWA 856
- Eprint ID
- 108624
- Resolver ID
- CaltechAUTHORS:20210406-073652948
- DE-FG02-94ER14466
- Department of Energy (DOE)
- DE-NA0001974
- Department of Energy (DOE)
- EAR-1634415
- NSF
- EAR-1128799
- NSF
- EAR-1322082
- NSF
- DE-AC02-06CH11357
- Department of Energy (DOE)
- DE-AC02-05CH11231
- Department of Energy (DOE)
- EAR-0318518
- NSF
- EAR-1322082
- NSF
- DMR-0080065
- NSF
- DE-NA0001982
- Department of Energy (DOE)
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Canada Foundation for Innovation
- New Brunswick Innovation Foundation
- Created
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2021-04-08Created from EPrint's datestamp field
- Updated
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2021-04-08Created from EPrint's last_modified field