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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:help 2.74 kg
Classification
  history:
Recommended:  Lunar (feldsp. breccia)    [explanation]

This is 1 of 181 approved meteorites classified as Lunar (feldsp. breccia).   [show all]
Search for other: Lunar meteorites
Comments: Approved 7 Nov 2019
Writeuphelp
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 Fa30.4±12.5, n=26; low-Ca pyroxene Fs22.1±10.3Wo3.5±0.8, Fe/Mn=63±8, n=8); augite Fs26.9±11.0Wo22.6±14.1, n=17, plagioclase An97.3±1.9Or0.2±0.3Ab2.6±1.9, n=11. (C. Agee, UNM) Olivine Fa30.0±10.9, Fe/Mn=88±8, n=6; pigeonite Fs28.9±6.0Wo13.2±5.8, Fe/Mn=53±9, n=3; augite Fs20.0±14.9Wo39.2±7.3, Fe/Mn=42±2, n=3, plagioclase An96.3±0.6Or0.2±0.1Ab3.5±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, in preparation (2019)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7005 approved meteorites from (Northwest Africa) (plus 2002 unapproved names)

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