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Northwest Africa 8734
Basic information Name: Northwest Africa 8734
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 8734
Observed fall: No
Year found: 2014
Country: (Northwest Africa)
Mass:help 61.6 g
Meteoritical Bulletin:  MB 104  (2015)  Lodranite
Recommended:  Lodranite    [explanation]

This is 1 of 89 approved meteorites classified as Lodranite.   [show all]
Search for other: Acapulcoite-lodranite family, Lodranites, and Primitive achondrites
Comments: Approved 4 Feb 2015
Writeup from MB 104:

Northwest Africa 8734 (NWA 8734)

(Northwest Africa)

Found: 2014

Classification: Primitive achondrite (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 primarily dark colored, coarse grains (~1-2 mm), with a few scattered lighter grains in a dark matrix.

Petrography: (C. Agee, UNM) Microprobe examination of the deposit sample, shows a poikilitic to granulitic texture of pyroxene and olivine grains. Plagioclase makes up approximately 10% of this meteorite. Accessory phases include Fe-Ni metal, iron oxide veinlets, chromite, apatite, and Fe-P blebs.

Geochemistry: (C. Agee and N. Muttik, UNM). olivine Fa12.6±0.1, Fe/Mn=23±1, n=11; low-Ca pyroxene Fs11.5±0.6Wo1.9±0.5, Fe/Mn=14±0, n=8; diopside Fs3.3±1.3Wo46.3±1.0, Fe/Mn=9±3, Cr2O3=1.33±0.03 (wt%), n=6; subcalcic augite Fs5.6±0.6Wo28.0±0.4, Fe/Mn=17±2, n=4; plagioclase An14.6±4.6Ab82.1±3.6Or3.3±1.1, n=6.

Classification: Primitive achondrite (lodranite). Classification based on relatively coarse grain-size compared to acapulcoites. Moderate weathering grade, low shock stage.

Specimens: A total of 13 g including a probe mount on deposit at UNM. DPitt holds the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase:Mauritania
Mass (g):61.6
Shock stage:low
Weathering grade:moderate
Fayalite (mol%):12.6±0.1
Ferrosilite (mol%):11.5±0.6
Wollastonite (mol%):1.9±0.5
Classifier:C. Agee, UNM
Type spec mass (g):13
Type spec location:UNM
Main mass:Darryl Pitt
Comments:Field name MAC 87; submitted by C. Agee, UNM
   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)
References: Published in Meteoritical Bulletin, no. 104, MAPS 52, 2284, Octover 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12930/full
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     This is 1 of 8904 approved meteorites from (Northwest Africa) (plus 1871 unapproved names)

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