Meteoritical Bulletin: Entry for Northwest Africa 12447

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Northwest Africa 12447

Basic information

Name: Northwest Africa 12447
This is an OFFICIAL meteorite name.
Abbreviation: NWA 12447
Observed fall: No
Year found: 2004
Country: (Northwest Africa)
Mass: 413 g

Classification
history:

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

This is 1 of 59 approved meteorites classified as Brachinite. [show all]
Search for other: Brachinites, Primitive achondrites

Comments:

Approved 27 Jul 2019

Writeup

help

Writeup from MB 108:

Northwest Africa 12447 (NWA 12447)

(Northwest Africa)

Find: 2004

Classification: Primitive achondrite (Brachinite)

History: Found in southern Morocco in 2004 and purchased by a German collector; the specimen was subsequently acquired by Craig Zlimen in August 2018.

Petrography: (A. Irving and S. Kuehner, UWS) Protogranular aggregate composed predominantly of olivine (with reduced magnesian rims) plus subordinate clinopyroxene and accessory intermediate plagioclase, chlorapatite, Ti-V-bearing chromite, kamacite, troilite and minor secondary barite. Grain boundaries and fractures are decorated with fine grained assemblages of Fe metal plus magnesian orthopyroxene.

Geochemistry: Olivine (cores Fa_28.8-30.6, FeO/MnO = 48-64; rim Fa_20.1, FeO/MnO = 36; N = 3), clinopyroxene (Fs_10.3-10.6Wo_44.9-44.8, FeO/MnO = 37-39, N = 2), orthopyroxene at grain boundaries (Fs_20.3Wo_0.8, FeO/MnO = 23), plagioclase (An_34.9-35.9Or_0.4, N = 2).

Classification: Brachinite. This ultramafic achondrite has many mineralogical features in common with NWA 7388 and NWA 7605 (Irving et al., 2013) and may be related to those specimens.

Specimens: 23.6 g including one polished thin section at UWB; remainder with Mr. C. Zlimen.

Bibliography:

Irving A.J., Kuehner S.M., and Ziegler K. (2013) Petrology and Oxygen Isotopic Composition of Brachinite-like Achondrites Northwest Africa 7388 And Northwest Africa 7605, and Evidence for Late-stage Methane-triggered Reduction. Lunar Planet. Sci. Conf. 44, abstract #2192. (link)

Data from:
  MB108
  Table 0
  Line 0:

Place of purchase:	Germany
Date:	2004
Mass (g):	413
Pieces:	several
Class:	Brachinite
Shock stage:	low
Weathering grade:	low
Fayalite (mol%):	28.8-30.6
Ferrosilite (mol%):	10.3-10.6
Wollastonite (mol%):	44.9-44.8
Classifier:	A. Irving and S. Kuehner, UWS
Type spec mass (g):	23.6
Type spec location:	UWB
Main mass:	C. Zlimen
Comments:	Work name ZLI04; 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)
UWB: University of Washington, Burke Museum of Natural History and Culture, Box 353010 Seattle, WA 98195, United States (institutional address; updated 9 Oct 2023)

Catalogs:

References:

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

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Photos:

Credit	Photos
Photos uploaded by members of the Encyclopedia of Meteorites. (Caution, these are of unknown reliability)
Ziyao Wang
Public domain photographs:
A. Irving

Geography:

Coordinates:

Unknown.

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

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Revision
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