Meteoritical Bulletin: Entry for Northwest Africa 12009

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Northwest Africa 12009

Basic information

Name: Northwest Africa 12009
This is an OFFICIAL meteorite name.
Abbreviation: NWA 12009
Observed fall: No
Year found: 2017
Country: (Northwest Africa)
Mass: 5.75 kg

Classification
history:

Meteoritical Bulletin:	MB 107	(2018)	LL3
Recommended:			LL3 [explanation]

This is 1 of 462 approved meteorites classified as LL3. [show all]
Search for other: LL chondrites, LL chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)

Comments:

Approved 11 Dec 2018

Writeup

Writeup from MB 107:

Northwest Africa 12009 (NWA 12009)

(Northwest Africa)

Purchased: 2017 Jun

Classification: Ordinary chondrite (LL3)

History: Purchased by Marc Jost in June 2017 from a Moroccan dealer at the Ensisheim Show.

Petrography: (A. Irving and S. Kuehner, UWS) Well-formed, fairly closely packed chondrules (apparent diameter 950±610 µm, N = 24) are set in relatively fine grained matrix containing altered metal, merrillite and chlorapatite.

Geochemistry: Olivine (Fa_1.2-98.0, Cr₂O₃ in ferroan examples 0.09-0.18 wt.%, mean 0.1±0.04 wt.%, N = 7), orthopyroxene (Fs_2.1-17.0Wo_0.4-2.4, N = 3), subcalcic augite (Fs_47.1Wo_31.2), augite (Fs_9.4Wo_42.5). Magnetic susceptibility log χ (× 10^-9 m³/kg) = 3.61.

Classification: Ordinary chondrite (LL3).

Specimens: 22.7 g including one polished thin section at UWB; remainder held by SJS.

Data from:
  MB107
  Table 0
  Line 0:

Place of purchase:	Ensisheim
Date:	P 2017 Jun
Mass (g):	5751
Pieces:	24
Class:	LL3
Shock stage:	S2
Weathering grade:	W2
Fayalite (mol%):	1.2-98.0
Ferrosilite (mol%):	10.1±7.4 (N=3)
Wollastonite (mol%):	1.6±1.1
Magnetic suscept.:	3.61
Classifier:	A. Irving and S. Kuehner, UWS
Type spec mass (g):	22.7
Type spec location:	UWB
Main mass:	M. Jost
Comments:	Work name SJS18004; 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, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
SJS: Space Jewels Switzerland, 2555 Brügg, Switzerland (private address; updated 3 Jan 2010)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462

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Photos:

Credit	Photos
Photos from the Encyclopedia of Meteorites:
Sergey Vasiliev
Photos uploaded by members of the Encyclopedia of Meteorites. (Caution, these are of unknown reliability)
Robert Smart
Ryan Upchurch

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9305 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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