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

We present the crystal structure, composition, and occurrence of stofflerite, the naturally occurring Ca-aluminosilicate with hollandite-type structure. Stofflerite is a high-pressure polymorph of anorthite and an approved mineral. The type material was found in the shergottitic martian meteorite No...

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Bibliographic Details
Published inThe American mineralogist Vol. 106; no. 4; pp. 650 - 655
Main Authors Tschauner, Oliver, Ma, Chi, Spray, John G, Greenberg, Eran, Prakapenka, Vitali B
Format Journal Article
LanguageEnglish
Published Washington Mineralogical Society of America 01.04.2021
Walter de Gruyter GmbH
Subjects
achondrites
Aluminosilicates
Aluminum
Anorthite
chemical composition
compression
Crystal structure
Crystals
Dimensions
electron probe data
feldspar group
framework silicates
High pressure
hollandite
lattice parameters
Martian meteorites
metamorphism
meteorites
meteorites and tektites
Meteors & meteorites
Mineralogy
new mineral
new minerals
Northwest Africa Meteorites
NWA 856
oxides
Petrology
plagioclase
polymorphism
pressure
shergottite
shock compression
shock metamorphism
silicates
Silicon
SNC Meteorites
space groups
stofflerite
stony meteorites
Unit cell
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Summary:We present the crystal structure, composition, and occurrence of stofflerite, the naturally occurring Ca-aluminosilicate with hollandite-type structure. Stofflerite 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 stofflerite (Sto60Lin40) assumes space group I4/m with unit-cell dimensions a=9.255(1) Å, c=2.742(3) Å, V=235.1(2) Å, and Z=2.
ISSN:0003-004X
1945-3027
DOI:10.2138/am-2021-7563