Meteoritical Bulletin: Entry for Northwest Africa 11967

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Northwest Africa 11967

Basic information

Name: Northwest Africa 11967
This is an OFFICIAL meteorite name.
Abbreviation: NWA 11967
Observed fall: No
Year found: 2015
Country: (Northwest Africa)
Mass: 2.35 kg

Classification
history:

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

This is 1 of 487 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 23 Sep 2018

Writeup

help

Writeup from MB 107:

Northwest Africa 11967 (NWA 11967)

(Northwest Africa)

Purchased: 2015

Classification: Ordinary chondrite (LL3)

History: Purchased by Jay Piatek on June 26, 2015, from a Moroccan meteorite dealer.

Physical characteristics: Single stone, weathered exterior. A saw cut reveals numerous distinct, closely packed chondrules set in a brown groundmass. Mild brecciation was observed.

Petrography: (C. Agee, UNM) This meteorite has many porphyritic chondrules, most with mesostasis or glass, set in abundant opaque matrix. Apparent mean chondrule size is 800±500 μm, n=19.

Geochemistry: (C. Agee, UNM) Coarse-grained (non-matrix) ferroan olivine Fa_23.3±8.2, Cr₂O₃=0.18±0.22 (wt%), n=17; low-Ca pyroxene Fs_15.5±11.1Wo_0.8±0.5, n=11.

Classification: Ordinary chondrite LL3 breccia. Cr₂O₃ distribution in olivine is similar to Ngawi (LL3.0-3.7) as described in Grossman and Brearley (2005)) with two populations, one resembling Semarkona Cr₂O₃=0.50±0.08 and one resembling Bremervörde Cr₂O₃=0.04±0.03 (wt%).

Specimens: 22.4 g including a probe mount on deposit at UNM, Jay Piatek holds the main mass.

Bibliography:

Grossman J.N. and Brearley A.J. (2005) The onset of metamorphism in ordinary and carbonaceous chondrites. Meteorit. Planet. Sci. 40, 87-122. (link)

Data from:
  MB107
  Table 0
  Line 0:

Place of purchase:	Morocco
Date:	P 2015
Mass (g):	2347.3
Pieces:	1
Class:	LL3
Shock stage:	S3
Weathering grade:	W2
Fayalite (mol%):	23.3±8.2
Ferrosilite (mol%):	15.5±11.1
Wollastonite (mol%):	0.8±0.5
Classifier:	C. Agee, UNM
Type spec mass (g):	22.4
Type spec location:	UNM
Main mass:	Jay Piatek
Comments:	Field name JP-90; submitted by C. Agee, UNM

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)

Catalogs:

References:

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

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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9699 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

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Revision
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