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Northwest Africa 12270
Basic information Name: Northwest Africa 12270
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12270
Observed fall: No
Year found: 2018
Country: Mauritania
Mass:help 1300 g
Meteoritical Bulletin:  MB 107  (2018)  Lunar (feldsp. breccia)
Recommended:  Lunar (feldsp. breccia)    [explanation]

This is 1 of 288 approved meteorites classified as Lunar (feldsp. breccia).   [show all]
Search for other: Lunar meteorites
Comments: Approved 2 Dec 2018
Writeup from MB 107:

Northwest Africa 12270 (NWA 12270)


Purchased: 2018

Classification: Lunar meteorite (feldspathic breccia)

History: Purchased by Terry Boudreaux from a meteorite dealer in Mauritania.

Physical characteristics: Six identically appearing pieces, no fusion crust, saw cut reveals a fragmental breccia with numerous white feldspathic clasts set in a dark gray ground mass.

Petrography: (C. Agee, UNM) This meteorite consists of primarily of fragmental pyroxene, olivine, feldspathic clasts and shock melt. Ubiquitous Ti-rich chromite and ilmenite present, rare Fe-Ni metal detected.

Geochemistry: (C. Agee, UNM) olivine Fa42.7±7.3, Fe/Mn=94±9, n=14; pigeonite Fs37.0±8.0Wo17.9±6.9, Fe/Mn=56±5, n=13; plagioclase An96.6±0.4, n=6; Shock melt (20 μm defocused electron beam, proxy for bulk meteorite composition): SiO2=44.8±1.3, TiO2=0.31±0.08, Al2O3=26.0±3.9, Cr2O3=0.15±0.09, MgO=5.0±2.2, FeO=5.9±1.7, MnO=0.08±0.03, CaO=16.1±1.8, NiO=0.02±0.01, Na2O=0.44±0.07, K2O=0.08±0.01 (all wt%), n=7.

Classification: Lunar feldspathic breccia

Specimens: 29.2 g including a probe mount on deposit at UNM, Terry Boudreaux holds the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase:Mauritania
Date:P 2018
Mass (g):1300
Class:Lunar (feldsp. breccia)
Shock stage:high
Weathering grade:moderate
Fayalite (mol%):42.7±7.3
Ferrosilite (mol%):37.0±8.0
Wollastonite (mol%):17.9±6.9
Classifier:C. Agee, UNM
Type spec mass (g):29.2
Type spec location:UNM
Main mass:Terry Boudreaux
Comments:Field name MF-6; 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)
Boudreaux: Terry Boudreaux, Illinois, United States (private address)
References: Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462
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     This is 1 of 183 approved meteorites from Mauritania (plus 1 unapproved name) (plus 2 impact craters)

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