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Northwest Africa 8732
Basic information Name: Northwest Africa 8732
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 8732
Observed fall: No
Year found: 2014
Country: (Northwest Africa)
Mass:help 357 g
Classification
  history:
Meteoritical Bulletin:  MB 104  (2015)  Acapulcoite/Lodranite
Recommended:  Acapulcoite/Lodranite    [explanation]

This is 1 of 11 approved meteorites classified as Acapulcoite/Lodranite.   [show all]
Search for other: Acapulcoite-lodranite family, Primitive achondrites
Comments: Approved 4 Feb 2015
Writeuphelp
Writeup from MB 104:

Northwest Africa 8732 (NWA 8732)

(Northwest Africa)

Found: 2014

Classification: Primitive achondrite (Acapulcoite/Lodranite)

History: Recovered in April 2014 near the borders of Mauritania, Western Sahara and Algeria. Purchased in Mauritania in June 2014.

Physical characteristics: A single stone with weathered exterior. A saw cut reveals a mixture of coarse-grained light colored (>1 mm), but also fine grained material, metal and oxidized metal.

Petrography: (C. Agee, UNM) Microprobe examination of the deposit sample, shows a brecciated texture with highly variable pyroxene and olivine grain size. Plagioclase makes up approximately 10-20% of this meteorite. Accessory phases include Fe-Ni metal, iron oxide, and chromite.

Geochemistry: (C. Agee and N. Muttik, UNM). olivine Fa13.2±0.1, Fe/Mn=25±1, n=12; low-Ca pyroxene Fs11.4±0.6Wo1.5±0.5, Fe/Mn=15±0, n=8; diopside Fs5.2±1.3Wo44.5±1.6, Fe/Mn=12±2, Cr2O3=0.69±0.09 (wt%), n=4; oligoclase plagioclase An15.7±3.0Ab81.3±2.7Or3.0±0.4, n=6; andesine plagioclase An49.4Ab49.7Or1.0, n=1.

Classification: Primitive achondrite, transitional between acapulcoite and lodranite. Some domains contain coarse pyroxene crystals >1 mm (lodranite-like) whereas other domains are fine grained ~100-300 μm (acapulcoite-like); also there is a significant amount of plagioclase present indicative of acapulcoite (Goodrich et al., 2010), moderate weathering grade, high shock stage.

Specimens: A total of 22 g including a probe mount on deposit at UNM. DPitt holds the main mass.

Bibliography:
  • Goodrich C.A., Kita N.T., Spicuzza M.J., Valley J.W., Zipfel J., Mikouchi T. and Miyamoto M. (2010) The Northwest Africa 1500 meteorite: Not a ureilite, maybe a brachinite. Meteorit. Planet. Sci. 45, 1906-1928 (link)
Data from:
  MB104
  Table 0
  Line 0:
Place of purchase:Mauritania
Date:2014
Mass (g):357.4
Pieces:1
Class:Acapulcoite/Lodranite
Shock stage:high
Weathering grade:moderate
Fayalite (mol%):13.2±0.1
Ferrosilite (mol%):11.4±0.6
Wollastonite (mol%):1.5±0.5
Classifier:C. Agee, UNM
Type spec mass (g):22
Type spec location:UNM
Main mass:Darryl Pitt
Comments:Field name MAC 85; submitted by C. Agee, UNM
Institutions
   and collections
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
DPitt: Darryl Pitt, 225 West 83rd Street, New York, NY 10024, United States; Website (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 104, MAPS 52, 2284, Octover 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12930/full
Find references in NASA ADS:
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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7035 approved meteorites from (Northwest Africa) (plus 2000 unapproved names)

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