Meteoritical Bulletin: Entry for Northwest Africa 12909

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Northwest Africa 12909

Basic information

Name: Northwest Africa 12909
This is an OFFICIAL meteorite name.
Abbreviation: NWA 12909
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass: 2.74 kg

Classification
history:

Meteoritical Bulletin:	MB 108	(2020)	Lunar (feldsp. breccia)
Recommended:			Lunar (feldsp. breccia) [explanation]

This is 1 of 340 approved meteorites classified as Lunar (feldsp. breccia). [show all]
Search for other: Lunar meteorites

Comments:

Approved 7 Nov 2019

Writeup

help

Writeup from MB 108:

Northwest Africa 12909 (NWA 12909)

(Northwest Africa)

Purchased: 2019

Classification: Lunar meteorite (feldspathic breccia)

History: Purchased by Zuokai Ke in Chenzhou, China, in May 2019 from Moroccan meteorite dealer.

Physical characteristics: Single stone, desert weathered exterior, sawcuts reveal a fragmental breccia with many white, feldspathic clasts set in a dark-gray groundmass.

Petrography: (X. Gu, CSU-China; C. Agee, UNM) This meteorite is composed of anorthite (55%), olivine (23%), augite (15%), orthopyroxene (6%), with ubiquitous minor kamacite, troilite, ulvospinel, ilmenite, Cr-spinel, silica, schreibersite and pentlandite. Brecciated clasts sizes range from several micrometers to 1 mm.

Geochemistry: (X. Gu, CSU-China) Olivine Fa_30.4±12.5, n=26; low-Ca pyroxene Fs_22.1±10.3Wo_3.5±0.8, Fe/Mn=63±8, n=8); augite Fs_26.9±11.0Wo_22.6±14.1, n=17, plagioclase An_97.3±1.9Or_0.2±0.3Ab_2.6±1.9, n=11. (C. Agee, UNM) Olivine Fa_30.0±10.9, Fe/Mn=88±8, n=6; pigeonite Fs_28.9±6.0Wo_13.2±5.8, Fe/Mn=53±9, n=3; augite Fs_20.0±14.9Wo_39.2±7.3, Fe/Mn=42±2, n=3, plagioclase An_96.3±0.6Or_0.2±0.1Ab_3.5±0.6, n=3.

Classification: Lunar feldspathic breccia

Specimens: 23.2 g including a probe mount on deposit at UNM, Zuokai Ke holds the main mass.

Data from:
  MB108
  Table 0
  Line 0:

Place of purchase:	Chenzhou, China
Date:	P 2019
Mass (g):	2742
Pieces:	1
Class:	Lunar (feldsp. breccia)
Shock stage:	high
Weathering grade:	moderate
Fayalite (mol%):	30.0±10.9
Ferrosilite (mol%):	28.9±6.0, 20.0±14.9
Wollastonite (mol%):	13.2±5.8, 39.2±7.3
Classifier:	X. Gu, CSU-China; C. Agee, UNM
Type spec mass (g):	23.2
Type spec location:	UNM
Main mass:	Zuokai Ke
Comments:	Field name KE-52; 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)
CSU: Department of Geosciences Colorado State University Fort Collins, CO 80523 , United States (institutional address; updated 21 Jan 2019)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150

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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9710 approved meteorites from (Northwest Africa) (plus 1853 unapproved names)

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Revision
history:

This lists important revisions made to data for this record.

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