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Northwest Africa 10497
Basic information Name: Northwest Africa 10497
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 10497
Observed fall: No
Year found: 2011
Country: (Northwest Africa)
Mass:help 15 g
Classification
  history:
Meteoritical Bulletin:  MB 105  (2016)  Brachinite
Recommended:  Brachinite    [explanation]

This is 1 of 46 approved meteorites classified as Brachinite.   [show all]
Search for other: Brachinites, Primitive achondrites
Comments: Approved 12 May 2016
Writeuphelp
Writeup from MB 105:

Northwest Africa 10497 (NWA 10497)

(Northwest Africa)

Purchased: 2011 Dec

Classification: Primitive achondrite (Brachinite)

History: Purchased in December 2011 by Scott Feek from Gary Fujihara who had acquired it from a Moroccan dealer.

Petrography: (A. Irving, UWS) Protogranular aggregate of olivine (~80 vol.%) with subordinate orthopyroxene and clinopyroxene, plus accessory chromite, chlorapatite and taenite.

Geochemistry: (P. Carpenter, WUSL) Olivine (Fa29.9-30.4, FeO/MnO = 60-61, N = 3), orthopyroxene (Fs24.4-24.6Wo2.3-2.2, FeO/MnO = 36-37, N = 2), clinopyroxene (Fs9.8-9.9Wo44.0-44.3, FeO/MnO = 26-28, N = 2). Oxygen isotopic composition (J. Gattacceca, C. Sonzogni, CEREGE) from analysis of one acid-washed 1.5 mg aliquot of a powdered 50 mg bulk sample is δ17O=2.22‰, δ18O=4.67‰ , Δ17O=-0.22‰ (linearized, slope 0.5247, analytical uncertainties 0.08‰, 0.12‰, 0.03‰ respectively).

Classification: Primitive achondrite (brachinite). Although the mineralogy and mineral compositions are similar to those in NWA 5400 and paired stones, the oxygen isotopic composition is quite different (but similar to that for NWA 6152)

Specimens: 3.25 g plus one polished thin section at UWB; remainder with Mr. S. Feek.

Data from:
  MB105
  Table 0
  Line 0:
Place of purchase:Hilo, Hawaii
Date:P 2011 Dec
Mass (g):14.97
Pieces:1
Class:Brachinite
Shock stage:low
Weathering grade:low
Fayalite (mol%):29.9-30.4
Ferrosilite (mol%):24.4-24.6; 9.8-9.9
Wollastonite (mol%):2.3-2.2; 44.0-44.3
Classifier:A. Irving and P. Carpenter, UWS
Type spec mass (g):3.25
Type spec location:UWB
Main mass:S. Feek
Comments:SF15-3; submitted by A. Irving
Plots: O isotopes:  
Institutions
   and collections
CEREGE: CEREGE BP 80 Avenue Philibert, Technopole de l'Arbois 13545 Aix-en-Provence Cedex 4 France, France (institutional address; updated 29 Oct 2018)
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
WUSL: Washington Univ., One Brookings Drive, St. Louis, MO 63130, United States (institutional address; updated 17 Oct 2011)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
Catalogs:
References: Published in Meteoritical Bulletin, no. 105, MAPS 52, 2411, September 2017. http://onlinelibrary.wiley.com/doi/10.1111/maps.12944/full
Find references in NASA ADS:
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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6781 approved meteorites from (Northwest Africa) (plus 2061 unapproved names)

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