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Northwest Africa 11787
Basic information Name: Northwest Africa 11787
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11787
Observed fall: No
Year found: 2017
Country: Mauritania
Mass:help 23.5 kg
Classification
  history:
Meteoritical Bulletin:  MB 107  (2018)  Lunar (feldsp. breccia)
Recommended:  Lunar (feldsp. breccia)    [explanation]

This is 1 of 201 approved meteorites classified as Lunar (feldsp. breccia).   [show all]
Search for other: Lunar meteorites
Comments: Approved 26 May 2018
Writeuphelp
Writeup from MB 107:

Northwest Africa 11787 (NWA 11787)

Mauritania

Purchased: 2017

Classification: Lunar meteorite (feldspathic breccia)

History: Purchased in Mauritania by Dustin Dickens from anonymous meteorite hunter.

Physical characteristics: Many visually identical appearing pieces, ranging from several kilograms to sub-gram fragments. Some pieces show a light-gray, remnant fusion crust on one or more faces, with most having no fusion crust. Saw cut reveals a fragmental breccia with white feldspathic clasts set in a dark-gray ground mass.

Petrography: (C. Agee, UNM) This meteorite is a polymict breccia of fragmental feldspathic, troctolitic and mafic lithologies, as well as fragmental pyroxene, olivine, plagioclase grains, and shock melt with vescicles.

Geochemistry: (C. Agee, UNM) olivine Fa: 25.6±8.9, Fe/Mn=95±18, n=13; low-Ca pyroxene Fs26.2±8.8Wo6.2±2.5, Fe/Mn=52±4, n=7; subcalcic augite Fs35.9±5.8Wo26.9±7.9, Fe/Mn=69±5, n=2; augite Fs14.5±7.1Wo41.0±2.0, Fe/Mn=45±15, n=3; plagioclase An96.2±0.8, n=6; Shock melt (20 _m defocused electron beam, proxy for bulk meteorite composition): SiO2=42.9±0.4, TiO2=0.11±0.05, Al2O3=31.1±4.0, Cr2O3=0.10±0.05, MgO=5.1±3.3, FeO=3.3±2.0, MnO=0.05±0.05, CaO=16.6±1.6, Na2O=0.37±0.06, K2O=0.04±0.00 (all wt%), n=3.

Classification: Lunar feldspathic breccia

Specimens: 21.25 g including a probe mount on deposit at UNM, Dustin Dickens holds the main mass.

Data from:
  MB107
  Table 0
  Line 0:
Place of purchase:Mauritania
Date:P 2017
Mass (g):23500
Pieces:Many
Class:Lunar (feldsp. breccia)
Shock stage:high
Weathering grade:moderate
Fayalite (mol%):25.6±8.9
Ferrosilite (mol%):26.2±8.8, 35.9±5.8, 14.5±7.1
Wollastonite (mol%):6.2±2.5, 26.9±7.9, 41.0±2.0
Classifier:C. Agee, UNM
Type spec mass (g):21.25
Type spec location:UNM
Main mass:Dustin Dickens
Comments:Field name DD-20; submitted by C. Agee, UNM
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. 107, MAPS 55, 460-462
Find references in NASA ADS:
Find references in Google Scholar:
Geography:

Mauritania
Coordinates:Unknown.

Statistics:
     This is 1 of 127 approved meteorites from Mauritania (plus 1 unapproved name) (plus 2 impact craters)

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