Meteoritical Bulletin: Entry for Northwest Africa 13731

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Northwest Africa 13731

Basic information

Name: Northwest Africa 13731
This is an OFFICIAL meteorite name.
Abbreviation: NWA 13731
Observed fall: No
Year found: 2019
Country: Morocco
Mass: 2 kg

Classification
history:

Recommended:

H3 [explanation]

This is 1 of 663 approved meteorites (plus 2 unapproved names) classified as H3. [show all]
Search for other: H chondrites, H chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)

Comments:

Approved 6 Feb 2021

Writeup

Writeup from MB 110:

Northwest Africa 13731 (NWA 13731)

Morocco

Purchased: 2019

Classification: Ordinary chondrite (H3)

History: Purchased by Jesper Grønne in 2019 from a Moroccan dealer.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Well-formed, relatively small glass-bearing chondrules (apparent diameter 320±200 µm, N=24) are set in a recrystallized matrix containing altered metal, troilite, chlorapatite, taenite and chromite.

Geochemistry: Olivine (Fa_18.6±2.5, range Fa_13.9-22.1, Cr₂O₃ < 0.05 wt.%, N = 7), low-Ca pyroxene (Fs_17.4±5.2Wo_1.2±1.0, range Fs_13.8-26.5Wo_0.2-2.7, N = 5), subcalcic augite (Fs_18.6±9.8Wo_31.2±1.1, range Fs_11.7-25.5Wo_30.4-32.0, N = 2).

Classification: Ordinary chondrite (H3). This specimen is unequilibrated but of high petrologic subtype.

Specimens: 20.5 g including one polished thin section at UWB; remainder with Mr. J. Grønne.

Data from:
  MB110
  Table 0
  Line 0:

Place of purchase:	Morocco
Date:	P 2019
Mass (g):	2000
Pieces:	1
Class:	H3
Shock stage:	S2
Weathering grade:	W2
Fayalite (mol%):	18.6±2.5
Ferrosilite (mol%):	17.4±5.2
Wollastonite (mol%):	1.2±1.0
Classifier:	A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):	20.5
Type spec location:	UWB
Main mass:	J. Grønn
Comments:	Work name JG 048; 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. 110, in preparation (2021)

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Geography:

Morocco

Coordinates:

Unknown.

Statistics:
This is 1 of 1871 approved meteorites from Morocco (plus 24 unapproved names) (plus 1 impact crater)

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