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Northwest Africa 7297
Basic information Name: Northwest Africa 7297
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7297
Observed fall: No
Year found: 2010
Country: (Northwest Africa)
Mass:help 78.5 g
Classification
  history:
Meteoritical Bulletin:  MB 102  (2013)  Brachinite
Recommended:  Brachinite    [explanation]

This is 1 of 49 approved meteorites classified as Brachinite.   [show all]
Search for other: Brachinites, Primitive achondrites
Comments: Approved 29 Sep 2013
Writeuphelp
Writeup from MB 102:

Northwest Africa 7297 (NWA 7297)

(Northwest Africa)

Purchased: 2010

Classification: Primitive achondrite (Brachinite)

History: Purchased in Morocco in 2010.

Physical characteristics: Several stones totaling 78.8 g, rough, rusty exterior. Broken surface shows mosaic of lustrous brown fine-grained crystals. Sawn surface displays dark brown, partly gray crystalline matrix with rusty inclusions and fractures. Magnetic susceptibility log χ =4.07.

Petrography: Microprobe examination of a thin section shows olivine ~70%, Ca-pyroxene ~25%, opaques ~5%. Polygonal texture of silicate grain size up to 1 mm with triple junctions; intergranular chromite up to 0.5 mm.

Geochemistry: (R. Bartoschewitz, Bart, P. Appel and B. Mader, Kiel) Olivine Fa29.7-31.3, mean 30.55, σ = 0.39, Fe/Mn=59±8 (n=20); augite: Fs9.5-10.3En45.3-46.2Wo43.9-45.1, TiO2=0.2, Al2O3=0.8, Cr2O3=0.8, Na2O=0.5 wt.% (n=12). chromite: Cr/(Cr+Al) = 82, Fe/(Fe+Mg) = 77-78.

Classification: Primitive achondrite (Brachinite)

Specimens: 8.3 g on deposit at Kiel plus 7.7 g at MNRJ, main mass M. Bilet (As, Norway) and 7.7 g with Bart.

Data from:
  MB102
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2010
Mass (g):78.5
Pieces:several
Class:Brachinite
Fayalite (mol%):30.6 (29.7-31.3, n=20)
Magnetic suscept.:4.07
Classifier:Bart
Type spec mass (g):8.3 / 7.7
Type spec location:Kiel / MNRJ
Main mass:Bart
Finder:anonymous
Comments:Submitted by R. Bartoschewitz
Institutions
   and collections
Kiel: Geologisches und Mineralogisches Museum, Institut für Geowissenschaften, Christian-Albrechts-Universität Kiel, Ludewig-Mayn-Str. 10, D-24118 Kiel, Germany, Germany (institutional address; updated 13 Sep 2013)
MNRJ: Museu Nacional, Quinta da Boa Vista, Rio de Janeiro, CEP 20940-040, Brazil (institutional address; updated 26 Dec 2011)
Bart: Bartoschewitz Meteorite Laboratory, Lehmweg 53, D-38518 Gifhorn, Germany; Website (private address; updated 4 Aug 2013)
Catalogs:
References: Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6968 approved meteorites from (Northwest Africa) (plus 2012 unapproved names)

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