Meteoritical Bulletin: Entry for Northwest Africa 11474

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Northwest Africa 11474

Basic information

Name: Northwest Africa 11474
This is an OFFICIAL meteorite name.
Abbreviation: NWA 11474
Observed fall: No
Year found: 2017
Country: (Northwest Africa)
Mass: 586 g

Classification
history:

Meteoritical Bulletin:	MB 106	(2018)	Lunar (feldsp. breccia)
Recommended:			Lunar (feldsp. breccia) [explanation]

This is 1 of 344 approved meteorites classified as Lunar (feldsp. breccia). [show all]
Search for other: Lunar meteorites

Comments:

Approved 15 Nov 2017

Writeup

help

Writeup from MB 106:

Northwest Africa 11474 (NWA 11474)

(Northwest Africa)

Purchased: 2017

Classification: Lunar meteorite (feldspathic breccia)

History: Purchased by Dustin Dickens and Mendy Ouzillou from a Mauritanian meteorite dealer May 10, 2017.

Physical characteristics: Many identical appearing pieces, no fusion crust. A 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 feldspathic clasts and shock melt with lesser amounts of fragmental pyroxene and olivine.

Geochemistry: (C. Agee and B. Ha, UNM) olivine Fa_19.3±0.6, Fe/Mn=86±1, n=2; pigeonite Fs_24.8±0.5Wo_4.3±0.3, Fe/Mn=60±9, n=2; high Ca pyroxene Fs_27.4Wo_34.4, Fe/Mn=58, n=1; plagioclase An_97.8±0.7Ab_2.0±0.6Or_0.2±0.1, n=6; Shock melt (20 μm defocused electron beam, proxy for bulk meteorite composition): SiO₂=44.4±0.8, TiO₂=0.21±0.01, Al₂O₃=27.5±1.1, Cr₂O₃=0.07±0.02, MgO=5.7±1.4, FeO=4.2±1.3, MnO=0.07±0.02, CaO=16.2±0.5, Na₂O=0.42±0.04, K₂O=0.01±0.02 (all wt%), Fe/Mn=63±1, Mg#=70.1±1.1, n=3.

Classification: Lunar feldspathic breccia

Specimens: 20 g including a probe mount on deposit at UNM, Dustin Dickens and Mendy Ouzillou hold the main mass.

Data from:
  MB106
  Table 0
  Line 0:

Place of purchase:	Mauritania
Date:	P 2017
Mass (g):	586
Pieces:	Many
Class:	Lunar (feldsp. breccia)
Shock stage:	High
Weathering grade:	Moderate
Fayalite (mol%):	19.3±0.6
Ferrosilite (mol%):	24.8±0.5; 27.4
Wollastonite (mol%):	4.3±0.3; 34.4
Classifier:	C. Agee, UNM
Type spec mass (g):	20
Type spec location:	UNM
Main mass:	Dustin Dickens and Mendy Ouzillou
Comments:	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 Gattacceca J., Bouvier A., Grossman J., Metzler K., and Uehara M. (2019) Meteoritical Bulletin, no. 106. Meteorit. Planet. Sci. 54 in press.

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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9933 approved meteorites from (Northwest Africa) (plus 1837 unapproved names)

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