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

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

Published:2021-04-01 Issue:4 Volume:106 Page:650-655
ISSN:0003-004X
Container-title:American Mineralogist
language:en
Short-container-title:

Author:

Tschauner Oliver¹^ORCID,Ma Chi²^ORCID,Spray John G.³,Greenberg Eran⁴,Prakapenka Vitali B.⁴

Affiliation:

1. Department of Geoscience, University of Nevada Las Vegas, Nevada 89154, U.S.A.

2. Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California 91125, U.S.A.

3. Planetary and Space Science Centre, University of New Brunswick, New Brunswick E3B 5A3, Canada

4. GSECARS, University of Chicago, Argonne National Laboratory, Lemont, Illinois 60439, U.S.A.

Abstract

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) Å3, and Z = 2.

Publisher

Mineralogical Society of America

Subject

Geochemistry and Petrology,Geophysics

Link

https://pubs.geoscienceworld.org/msa/ammin/article-pdf/106/4/650/5265143/am-2021-7563.pdf

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