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Northwest Africa 11898
Basic information Name: Northwest Africa 11898
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11898
Observed fall: No
Year found: 2018
Country: Mali
Mass:help 768 g
Meteoritical Bulletin:  MB 107  (2018)  Lunar (feldsp. breccia)
Recommended:  Lunar (feldsp. breccia)    [explanation]

This is 1 of 336 approved meteorites classified as Lunar (feldsp. breccia).   [show all]
Search for other: Lunar meteorites
Comments: Approved 31 Aug 2018
Writeup from MB 107:

Northwest Africa 11898 (NWA 11898)


Purchased: 2018

Classification: Lunar meteorite (feldspathic breccia)

History: Purchased in March 2018 by Dustin Dickens from a meteorite dealer in Mali.

Physical characteristics: Several identical appearing dark stones covered partially with a milky-green fusion crust. Broken surface reveals a fragmental breccia with numerous white feldspathic clasts set in a dark colored ground mass.

Petrography: (C. Agee, UNM) This meteorite is a breccia of primarily feldspathic clasts, with lesser amounts of olivine and pyroxene fragments. The shock melt composition has a very high alumina content, vesicles occur throughout.

Geochemistry: (C. Agee, UNM) olivine Fa25.0±6.4, Fe/Mn=90±5, n=8; pigeonite Fs31.0±3.6Wo8.1±3.6, Fe/Mn=58±4, n=6; high-Ca pyroxene Fs22.3±3.7Wo35.0±4.7, Fe/Mn=52±5, n=4; plagioclase An96.3±0.7Ab3.5±0.7Or0.2±0.0, n=6; Shock melt (20 μm defocused electron beam, proxy for bulk meteorite composition): SiO2=43.1±0.6, TiO2=0.12±0.03, Al2O3=31.3±1.2, Cr2O3=0.03±0.01, MgO=2.0±0.5, FeO=2.5±0.5, MnO=0.03±0.01, CaO=18.0±0.4, Na2O=0.36±0.01, K2O=0.04±0.00 (all wt%), n=4.

Classification: Lunar feldspathic breccia

Specimens: 21.6 g including a probe mount on deposit at UNM, Dustin Dickens holds the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase:Mali
Date:P 2018
Mass (g):767.8
Class:Lunar (feldsp. breccia)
Shock stage:high
Weathering grade:low
Fayalite (mol%):25.0±6.4
Ferrosilite (mol%):31.0±3.6; 22.3±3.7
Wollastonite (mol%):8.1±3.6; 35.0±4.7
Classifier:C. Agee, UNM
Type spec mass (g):21.6
Type spec location:UNM
Main mass:Dustin Dickens
Comments:Field name DD-25; 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)
References: Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462
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     This is 1 of 116 approved meteorites from Mali (plus 2 unapproved names)

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