Meteoritical Bulletin: Entry for Northwest Africa 10643

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Northwest Africa 10643

Basic information

Name: Northwest Africa 10643
This is an OFFICIAL meteorite name.
Abbreviation: NWA 10643
Observed fall: No
Year found: 2016
Country: (Northwest Africa)
Mass: 43.6 g

Classification
history:

Meteoritical Bulletin:	MB 105	(2016)	Lunar (feldsp. breccia)
Recommended:			Lunar (feldsp. breccia) [explanation]

This is 1 of 214 approved meteorites classified as Lunar (feldsp. breccia). [show all]
Search for other: Lunar meteorites

Comments:

Approved 15 May 2016

Writeup

help

Writeup from MB 105:

Northwest Africa 10643 (NWA 10643)

(Northwest Africa)

Purchased: 2016

Classification: Lunar meteorite (feldspathic breccia)

History: Purchased from Jaouad Chaoui in Marrakesh, Morocco, December 2015; reportedly found in Mauritania.

Physical characteristics: Single stone, irregular exterior, no fusion crust. A saw cut reveals feldspathic clasts (up to 1 cm) set in a dark-gray groundmass.

Petrography: (C. Agee, UNM) This is a highly feldspathic breccia with primarily magnesian olivine (Fa₂₀) and pyroxene fragments scattered throughout. Minor amounts of more iron-rich olivine (Fa₄₁) and pigeonite (Fs₆₆Wo₂₃) were detected. Vesicular shock melt veins and pockets are also present.

Geochemistry: (C. Agee and M. Spilde, UNM) Olivine Fa_20.0±2.0, Fe/Mn=84±6, n=12; pigeonite Fs_33.5±8.9Wo_9.4±8.6, Fe/Mn=63±11, n=10; augite Fs_22.9±2.3Wo_40.1±0.8, Fe/Mn=58±5, n=2; plagioclase An_97.0±0.5, n=5; Shock melt (20 μm defocused electron beam, proxy for bulk meteorite composition): SiO₂=44.5±0.7, TiO₂=0.15±0.07, Al₂O₃=30.7±2.7, Cr₂O₃=0.06±0.04, MgO=5.2±1.9, FeO=2.9±1.1, MnO=0.04±0.00, CaO=17.0±1.0, NiO=0.01±0.01, Na₂O=0.37±0.02, K₂O=0.03±0.01 (all wt%), n=3.

Classification: Lunar (feldspathic breccia)

Specimens: 8.8 g including a probe mount on deposit at UNM; Jean Redelsperger holds the main mass.

Data from:
  MB105
  Table 0
  Line 0:

Place of purchase:	Morocco
Date:	P 2016
Mass (g):	43.56
Pieces:	1
Class:	Lunar (feldsp. breccia)
Shock stage:	high
Weathering grade:	moderate
Fayalite (mol%):	20.0±2.0
Ferrosilite (mol%):	33.5±8.9, 22.9±2.3
Wollastonite (mol%):	9.4±8.6, 40.1±0.8
Classifier:	C. Agee, UNM
Type spec mass (g):	8.8
Type spec location:	UNM
Main mass:	Jean Redelsperger
Comments:	Field name JR043; 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. 105, MAPS 52, 2411, September 2017. http://onlinelibrary.wiley.com/doi/10.1111/maps.12944/full

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Photos:

Credit	Photos
Photos uploaded by members of the Encyclopedia of Meteorites. (Caution, these are of unknown reliability)
Allmeteorite.com

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 7552 approved meteorites from (Northwest Africa) (plus 1969 unapproved names)

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