Meteoritical Bulletin: Entry for Northwest Africa 13203

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Northwest Africa 13203

Basic information

Name: Northwest Africa 13203
This is an OFFICIAL meteorite name.
Abbreviation: NWA 13203
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass: 6.98 kg

Classification
history:

Recommended:

L4 [explanation]

This is 1 of 1709 approved meteorites (plus 4 unapproved names) classified as L4. [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)

Comments:

Approved 16 Feb 2020

Writeup

Writeup from MB 109:

Northwest Africa 13203 (NWA 13203)

(Northwest Africa)

Purchased: 2020 Jan

Classification: Ordinary chondrite (L4)

History: Purchased by Darryl Pitt in January 2020 from a Moroccan dealer living in Spain.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Well-formed chondrules are set in a relatively coarse-grained, recrystallized matrix containing altered kamacite, taenite, troilite, Ti-chromite, merrillite and chlorapatite.

Geochemistry: Olivine (Fa_24.6±0.2, range Fa_24.4-24.8, N = 5), low-Ca pyroxene (Fs_20.6±0.2Wo_1.7±0.3, range Fs_20.3-20.9Wo_1.5-1.8, N = 5), augite (Fs_7.5±0.6Wo_45.2±1.0, range Fs_6.9-8.0Wo_46.3-44.5, N = 3), plagioclase (Ab_83.6An_10.3Or_6.1).

Classification: Ordinary chondrite (L4).

Specimens: 26.4 g including one polished thin section at UWB; remainder with DPitt.

Data from:
  MB109
  Table 0
  Line 0:

Place of purchase:	Spain
Date:	P 2020 Jan
Mass (g):	6976
Pieces:	1
Class:	L4
Shock stage:	S2
Weathering grade:	W2
Fayalite (mol%):	24.6±0.2
Ferrosilite (mol%):	20.6±0.2
Wollastonite (mol%):	1.7±0.1
Classifier:	A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):	26.4
Type spec location:	UWB
Main mass:	D. Pitt
Comments:	Work name MVCH 497; 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)
DPitt: Darryl Pitt, 225 West 83rd Street, New York, NY 10024, United States; Website (private address)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 109, in preparation (2020)

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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 7579 approved meteorites from (Northwest Africa) (plus 1969 unapproved names)

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