Meteoritical Bulletin: Entry for Northwest Africa 12839

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Northwest Africa 12839

Basic information

Name: Northwest Africa 12839
This is an OFFICIAL meteorite name.
Abbreviation: NWA 12839
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass: 68.8 g

Classification
history:

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

This is 1 of 102 approved meteorites classified as Lunar. [show all]
Search for other: Lunar meteorites

Comments:

Approved 11 Oct 2019

Writeup

help

Writeup from MB 108:

Northwest Africa 12839 (NWA 12839)

(Northwest Africa)

Purchased: 2019 June

Classification: Lunar (diabase)

History: Purchased by Ben Hoefnagels in June 2019 from a dealer in Agadir, Morocco.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Diabasic texture (mean grainsize 0.5 mm). Composed primarily of zoned clinopyroxene and maskelynite with accessory blade-like ilmenite, very sparse zoned olivine (~3 vol.%), Cr-Ti oxides, baddeleyite, probable zirconolite, troilite, merrillite, silica polymorph, fayalite and hedenbergite. Dark shock glass is present in pockets (vesicular) and as cross-cutting veinlets.

Geochemistry: Subcalcic augite (core Fs_28.8Wo_26.3, FeO/MnO = 50; rim Fs_72.4Wo_23.6, FeO/MnO = 77), augite (core Fs_21.2Wo_38.7, FeO/MnO = 47; rim Fs_81.5Wo_17.7, FeO/MnO =81), pigeonite (core Fs_41.8Wo_12.9,FeO/MnO = 65; rim Fs_69.8Wo_22.4, FeO/MnO = 77), olivine cores (Fa_37.6-39.5, FeO/MnO = 92-94, N = 3), olivine rims (Fa_54.1-68.2, FeO/MnO = 93-110, N = 3), fayalite (Fa_99.2, FeO/MnO = 95), maskelynite (An_87.5-88.2Or_0.3, N = 2).

Classification: Lunar (mare diabase, clinopyroxene-rich, olivine-poor).

Specimens: 14.1 g including one polished thin section at UWB; remainder with Mr. B. Hoefnagels.

Data from:
  MB108
  Table 0
  Line 0:

Place of purchase:	Agadir
Date:	P 2019 June
Mass (g):	68.75
Pieces:	1
Class:	Lunar (diabase)
Shock stage:	high
Weathering grade:	low
Fayalite (mol%):	37.6-68.2
Ferrosilite (mol%):	21.2-81.5
Wollastonite (mol%):	38.7-12.9
Classifier:	A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):	14.1
Type spec location:	UWB
Main mass:	B. Hoefnagels
Comments:	Work name BH211; submitted by A. Irving

Institutions
and collections

UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
WUSL: Washington Univ., One Brookings Drive, St. Louis, MO 63130, United States (institutional address; updated 17 Oct 2011)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)

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 9116 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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