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First crystal-structure determination of chromites from an acapulcoite and ordinary chondrites

Lenaz, Davide; Princivalle, Francesco and Schmitz, Birger LU (2015) In Mineralogical Magazine 79(3). p.755-765
Abstract
We report the first crystal-structure determinations of chromites from an acapulcoite and from ordinary chondrites. Cell edges range from 8.3212 (3) to 8.3501 (1) angstrom, while the oxygen positional parameters are in the range 0.2624 (3) to 0.26298 (9). Their compositions show they are very close to the chromite end-member FeCr2O4 with limited Al and Mg content. Titanium oxide content exceeds 1 wt.%, whereas the amount of Fe3+ is negligible. Extraterrestrial chromite is distinguished readily from terrestrial analogues on the basis of the cell edge and oxygen positional parameter. These distinctions will facilitate ongoing attempts to reconstruct the palaeoflux of meteorites to Earth from resistant extraterrestrial spinel grains recovered... (More)
We report the first crystal-structure determinations of chromites from an acapulcoite and from ordinary chondrites. Cell edges range from 8.3212 (3) to 8.3501 (1) angstrom, while the oxygen positional parameters are in the range 0.2624 (3) to 0.26298 (9). Their compositions show they are very close to the chromite end-member FeCr2O4 with limited Al and Mg content. Titanium oxide content exceeds 1 wt.%, whereas the amount of Fe3+ is negligible. Extraterrestrial chromite is distinguished readily from terrestrial analogues on the basis of the cell edge and oxygen positional parameter. These distinctions will facilitate ongoing attempts to reconstruct the palaeoflux of meteorites to Earth from resistant extraterrestrial spinel grains recovered from ancient sediments. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
meteorite flux, diffraction, single-crystal X-ray, ordinary chondrite, acapulcoite, chromite
in
Mineralogical Magazine
volume
79
issue
3
pages
755 - 765
publisher
Mineralogical Society of Great Britain and Ireland
external identifiers
  • wos:000364195000016
  • scopus:84942111747
ISSN
0026-461X
DOI
10.1180/minmag.2015.079.3.17
language
English
LU publication?
yes
id
dbc05039-b5e6-49a5-8f23-a5891fd8095a (old id 8398071)
date added to LUP
2015-12-21 09:32:59
date last changed
2017-09-24 03:15:49
@article{dbc05039-b5e6-49a5-8f23-a5891fd8095a,
  abstract     = {We report the first crystal-structure determinations of chromites from an acapulcoite and from ordinary chondrites. Cell edges range from 8.3212 (3) to 8.3501 (1) angstrom, while the oxygen positional parameters are in the range 0.2624 (3) to 0.26298 (9). Their compositions show they are very close to the chromite end-member FeCr2O4 with limited Al and Mg content. Titanium oxide content exceeds 1 wt.%, whereas the amount of Fe3+ is negligible. Extraterrestrial chromite is distinguished readily from terrestrial analogues on the basis of the cell edge and oxygen positional parameter. These distinctions will facilitate ongoing attempts to reconstruct the palaeoflux of meteorites to Earth from resistant extraterrestrial spinel grains recovered from ancient sediments.},
  author       = {Lenaz, Davide and Princivalle, Francesco and Schmitz, Birger},
  issn         = {0026-461X},
  keyword      = {meteorite flux,diffraction,single-crystal X-ray,ordinary chondrite,acapulcoite,chromite},
  language     = {eng},
  number       = {3},
  pages        = {755--765},
  publisher    = {Mineralogical Society of Great Britain and Ireland},
  series       = {Mineralogical Magazine},
  title        = {First crystal-structure determination of chromites from an acapulcoite and ordinary chondrites},
  url          = {http://dx.doi.org/10.1180/minmag.2015.079.3.17},
  volume       = {79},
  year         = {2015},
}