CaltechAUTHORS
Published April 2021 | Version public
Journal Article Metadata-only

Stöfflerite, (Ca,Na)(Si,Al)₄O₈ in the hollandite structure: A new high-pressure polymorph of anorthite from martian meteorite NWA 856

Creators

  • 1. ROR icon California Institute of Technology
  • 2. ROR icon University of New Brunswick
  • 3. ROR icon Argonne National Laboratory

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

Additional titles

Alternative title
Stöfflerite, (Ca,Na)(Si,Al)4O8 in the hollandite structure: A new high-pressure polymorph of anorthite from martian meteorite NWA 856

Identifiers

Eprint ID
108624
Resolver ID
CaltechAUTHORS:20210406-073652948

Funding

Department of Energy (DOE)
DE-FG02-94ER14466
Department of Energy (DOE)
DE-NA0001974
NSF
EAR-1634415
NSF
EAR-1128799
NSF
EAR-1322082
Department of Energy (DOE)
DE-AC02-06CH11357
Department of Energy (DOE)
DE-AC02-05CH11231
NSF
EAR-0318518
NSF
EAR-1322082
NSF
DMR-0080065
Department of Energy (DOE)
DE-NA0001982
Natural Sciences and Engineering Research Council of Canada (NSERC)
Canada Foundation for Innovation
New Brunswick Innovation Foundation

Dates

Created
2021-04-08
Created from EPrint's datestamp field
Updated
2021-04-08
Created from EPrint's last_modified field