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Arguin 002
Basic information Name: Arguin 002
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2021
Country: Mauritania
Mass:help 1146 g
Meteoritical Bulletin:  MB 112  (2023)  Lunar (norite)
Recommended:  Lunar (norite)    [explanation]

This is the only approved meteorite classified as Lunar (norite).
Search for other: Lunar meteorites
Comments: Approved 19 Mar 2023
Writeup from MB 112:

Arguin 002        20.649°N, 15.141°W

Inchiri, Mauritania

Purchased: 2021 Dec

Classification: Lunar meteorite (norite)

History: Two pieces of this meteorite (342 g and 127 g) were purchased by Bachir Salek in December 2021 from a dealer in Nouadhibou, Mauritania, who said that he had found them at 20.649°N, 15.141°W near Tijirit, Mauritania about 37 km east of the well-known Tasiast gold mine. Some of this material was subsequently purchased by Jay Piatek. On March 25, 2022, additional material (two larger pieces weighing 500 g and 100 g plus many small fragments) was recovered by a shepherd at the same location. 100.2 g of this material was purchased by Ziyao Wang in June 2022 from a dealer in Laayoune, Morocco, who sold the remainder to Luc Labenne.

Physical characteristics: The material has an overall beige color with clear glassy maskelynite grains and some thin, dark glassy shock veinlets visible. The very fresh fusion crust is consistent with this meteorite being a very recent fall.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL; A. Ross, and C. Agee, UNM) Relatively coarse grained igneous assemblage (grainsize up to ~1.2 mm) of predominantly orthopyroxene (exhibiting undulose extinction) and anorthite (completely converted to maskelynite) in approximately equal proportions. Orthopyroxene grains contain very small, rounded to irregular-shaped blebs of augite, which do not form continuous, crystallographically-rational exsolution lamellae. The overall amount of augite is only a few vol.% and olivine is absent. Accessory phases include troilite and kamacite (each as discrete grains and in composite grains), taenite, low-Ti chromite (associated with troilite), REE-bearing merrillite (associated with chromite in veinlets), chlorapatite, Ni-poor Fe metal and rare zircon. Shock glass analyzed with a 20 micrometer defocused beam gave a bulk composition consistent with that of a mixture of orthopyroxene+anorthite.

Geochemistry: Orthopyroxene (Fs33.2-34.5Wo3.8-3.2, FeO/MnO = 62-73, N = 13), augite (Fs14.4-15.7Wo44.2-42.6, FeO/MnO = 47-65, N = 11), pigeonite bleb within augite (Fs33.7Wo8.8, FeO/MnO = 67), maskelynite (An91.2-92.6Or0.8-0.6, N = 13), shock glass (in wt.%, SiO2 47.8±1.0, TiO2 0.23±0.03, Al2O3 22.8±0.7, Cr2O3 0.18±0.03, MgO 7.3±0.5, FeO 7.0±0.6, MnO 0.09±0.02, CaO 12.0±0.8, Na2O 0.45±0.05, K2O 0.08±0.01.

Classification: Lunar (unbrecciated norite). Although much more heavily shocked than most others, this specimen has textural and mineralogical counterparts especially among the returned magnesian plutonic igneous samples from the Apollo 14, 16 and 17 landed lunar missions (e.g., Papike et al., 1998).

Specimens: 20.l g including a polished mount and one polished thin section at UWB; 30 g including a polished mount at UNM; 557 g with Labenne; 317 g with Mr. B. Salek; 122 g with Mr. J. Piatek; 100.2 g with WangZ.

Data from:
  Table 0
  Line 0:
Place of purchase:Nouadhibou and Laayoune
Date:P 2021 Dec
Mass (g):1146
Class:Lunar (norite)
Shock stage:high
Weathering grade:low
Ferrosilite (mol%):33.2-34.5; 14.4-15.7
Wollastonite (mol%):3.8-3.2; 44.2-42.6
Classifier:A. Irving, UWS, and P. Carpenter, WUSL; A. Ross, and C. Agee, UNM
Type spec mass (g):50.1
Type spec location:20.1 g UWB, 30 g UNM
Main mass:Labenne
Comments:Work names SMB-01 and BAS-40; submitted by A. Irving and C. Agee
   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)
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, Burke Museum of Natural History and Culture, Box 353010 Seattle, WA 98195, United States (institutional address; updated 9 Oct 2023)
Labenne: 23, rue de Esperance, 75013 Paris, France; Website (private address; updated 29 Aug 2012)
WangZ: Ziyao Wang, Hebei GEO University North Campus, Huai An dong road 127, Shijiazhuang, Hebei Province , China (private address; updated 25 Jun 2021)
References: Published in Meteoritical Bulletin, no. 112, in preparation (2023)
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Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Caleb McCudden   
Ziyao Wang               

     Recommended::   (20° 38' 56"N, 15° 8' 28"W)

     This is 1 of 2 approved meteorites from Inchiri, Mauritania
     This is 1 of 217 approved meteorites from Mauritania (plus 2 unapproved names) (plus 2 impact craters)
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