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Northwest Africa 8187
Basic information Name: Northwest Africa 8187
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 8187
Observed fall: No
Year found: 2013
Country: Western Sahara
Mass:help 682 g
Classification
  history:
Meteoritical Bulletin:  MB 103  (2014)  Eucrite-mmict
Recommended:  Eucrite-mmict    [explanation]

This is 1 of 230 approved meteorites classified as Eucrite-mmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 14 Mar 2014
Writeuphelp
Writeup from MB 103:

Northwest Africa 8187 (NWA 8187)        24.767°N, 13.0184°W

Western Sahara

Found: 2013

Classification: HED achondrite (Eucrite, monomict)

History: (H. Chennaoui Aoudjehane) Found in a small depression, late June 2013, by Mohmed and Mahdi Zergou while tending of herd of camels in the Zbayra area, near Guelta Zemmour, about 250 km southwest of Smara. A meteorite hunter Ahmed Akhebbach recognized the stone as a meteorite -- possibly a eucrite, collected the geographic coordinates, purchased it, and Ayoub Oumoussa submitted a deposit piece for classification.

Physical characteristics: Main mass 640 g, totally covered by black fusion crust, except one broken surface, plus smaller pieces found with it: 23 g, 15 g, 3 g. Interior reveals fresh, light gray, very fine-grained groundmass.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows a protogranular texture with approximately 50% pyroxene and 50% plagioclase, grain size 10-100 μm, many pyroxenes with exsolution lamellae. Millimeter-sized monomict clasts. Accessory low-Ni iron metal, silica, ilmenite, and troilite.

Geochemistry: (C. Agee and N. Muttik, UNM) EMPA. Low Ca-pyroxene Fs59.4±2.6Wo5.0±2.7, Fe/Mn=32±1, n=8; high-Ca pyroxene Fs30.0±2.6Wo39.7±3.1, Fe/Mn=34±2; n=6; plagioclase Or0.6±0.1Ab11.3±0.7An88.1±0.7, n=4.

Classification: Achondrite, equilibrated, monomict basaltic eucrite.

Specimens: 23.2 g including a probe mount on deposit at UNM, Ahmed Akhebbach and Ayoub Oumoussa jointly hold the main mass.

Data from:
  MB103
  Table 0
  Line 0:
State/Prov/County:Rio de Oro
Date:2013
Latitude:24.767°N
Longitude:13.0184°W
Mass (g):682
Pieces:4
Class:Eucrite-mmict
Classifier:C. Agee, UNM
Type spec mass (g):23.2
Type spec location:UNM
Main mass:Ahmed Akhebbach and Ayoub Oumoussa
Finder:Mohmed and Mahdi Zergou
Comments:Field name Zbayra; submitted by C. Agee
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)
Catalogs:
References: Published in Meteoritical Bulletin, no. 103, MAPS 52, 1014, May 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12888/full
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Geography:

Western Sahara
Coordinates:
     Recommended::   (24° 46' 1"N, 13° 1' 6"W)

Statistics:
     This is 1 of 37 approved meteorites from Rio de Oro, Western Sahara
     This is 1 of 211 approved meteorites from Western Sahara (plus 20 unapproved names)
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