Meteoritical Bulletin: Entry for Northwest Africa 10644

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Northwest Africa 10644

Basic information

Name: Northwest Africa 10644
This is an OFFICIAL meteorite name.
Abbreviation: NWA 10644
Observed fall: No
Year found: 2016
Country: (Northwest Africa)
Mass: 166 g

Classification
history:

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

This is 1 of 329 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 10644 (NWA 10644)

(Northwest Africa)

Purchased: 2016

Classification: Lunar meteorite (feldspathic breccia)

History: Purchased by Dustin Dickens, February 2016, from a Moroccan dealer and sold to Mendy Ouzillou.

Physical characteristics: Single stone, irregular exterior, no fusion crust. A saw cut reveals light-gray feldspathic clasts (up to 1 cm) and some smaller, fragmental, white plagioclase grains set in a dark-gray groundmass.

Petrography: (C. Agee, UNM) This is a feldspathic breccia showing several different textural domains: 1) poikilitic plagioclase with olivine and pyroxene inclusions, 2) zones of fragmental plagioclase, olivine, and pyroxene, 3) cataclastic zones of fine-grained (~20 μm) silicates, 4) vesicular shock melt veins and pockets. Pigeonite and augite show significant igneous, iron-enrichment trends.

Geochemistry: (C. Agee and M. Spilde, UNM) Olivine Fa_37.9±1.6, Fe/Mn=98±6, n=13; pigeonite Fs_39.3±13.9Wo_17.0±4.1, Fe/Mn=66±9, n=11; augite Fs_32.0±22.7Wo_37.4±1.1, Fe/Mn=60±20, n=2; plagioclase An_97.6±0.5, n=5; Shock melt (20 μm defocused electron beam, proxy for bulk meteorite composition): SiO₂=44.7±0.1, TiO₂=0.5±0.1, Al₂O₃=29.2±2.5, Cr₂O₃=0.09±0.05, MgO=4.0±1.4, FeO=5.3±1.7, MnO=0.06±0.02, CaO=16.4±1.0, NiO=0.03±0.02, Na₂O=0.48±0.01, K₂O=0.10±0.01 (all wt%), n=5.

Classification: Lunar (feldspathic breccia)

Specimens: 20.73 g including a probe mount on deposit at UNM; Mendy Ouzillou holds the main mass.

Data from:
  MB105
  Table 0
  Line 0:

Place of purchase:	Morocco
Date:	P 2016
Mass (g):	166
Pieces:	1
Class:	Lunar (feldsp. breccia)
Shock stage:	high
Weathering grade:	moderate
Fayalite (mol%):	37.9±1.6
Ferrosilite (mol%):	39.3±13.9, 32.0±22.7
Wollastonite (mol%):	17.0±4.1, 37.4±1.1
Classifier:	C. Agee, UNM
Type spec mass (g):	20.73
Type spec location:	UNM
Main mass:	Mendy Ouzillou
Comments:	Field name TMS-3; 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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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9429 approved meteorites from (Northwest Africa) (plus 1876 unapproved names)

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