Meteoritical Bulletin: Entry for Northwest Africa 7944

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Northwest Africa 7944

Basic information

Name: Northwest Africa 7944
This is an OFFICIAL meteorite name.
Abbreviation: NWA 7944
Observed fall: No
Year found: 2013
Country: (Northwest Africa)
Mass: 815 g

Classification
history:

Meteoritical Bulletin:	MB 102	(2013)	Martian (shergottite)
Recommended:			Martian (shergottite) [explanation]

This is 1 of 330 approved meteorites (plus 2 unapproved names) classified as Martian (shergottite). [show all]
Search for other: Martian meteorites

Comments:

Approved 30 Nov 2013

Writeup

help

Writeup from MB 102:

Northwest Africa 7944 (NWA 7944)

(Northwest Africa)

Purchased: 2013 Apr

Classification: Martian meteorite (Shergottite)

History: Purchased by Darryl Pitt in April 2013 from a dealer in Zagora, Morocco.

Physical characteristics: A single stone (815 g) lacking fusion crust.

Petrography: (A. Irving and S. Kuehner, UWS) Diabasic-textured assemblage of complexly-zoned clinopyroxene and lath-like maskelynite with accessory ulvöspinel, ilmenite, chlorapatite, merrillite, pyrrhotite and K-bearing glass. Marginal areas of some pyroxene grains consist of intergrowths of hedenbergite+fayalite+silica polymorph.

Geochemistry: Pigeonite (Fs_37.7-56.7Wo_11.7-20.9, FeO/MnO = 33-38, n = 4), subcalcic augite (Fs_26.7-39.1Wo_35.7-28.4; FeO/MnO = 31-34, n = 3), ferropigeonite (Fs_80.1-81.2Wo_13.1-12.9, FeO/MnO = 32-38, n = 2), plagioclase (An_40.1-49.6Or_3.3-1.1). Oxygen isotopes (D. Rumble, CIW): analyses of acid-washed silicate subsamples by laser fluorination gave, respectively: δ¹⁷O = 2.819, 2.615; δ¹⁸O = 4.892, 4.374; Δ¹⁷O = 0.246, 0.314 (all per mil).

Classification: Martian (shergottite, diabasic).

Specimens: 20.5 g and one polished thin section are at UWB. The remainder is held by DPitt.

Data from:
  MB102
  Table 0
  Line 0:

Place of purchase:	Zagora
Date:	P 2013 Apr
Mass (g):	815
Pieces:	1
Class:	Martian (shergottite)
Shock stage:	moderate
Weathering grade:	low
Ferrosilite (mol%):	37.7-56.7; 26.7-39.1
Wollastonite (mol%):	11.7-20.9; 35.7-28.4
Classifier:	A. Irving and S. Kuehner, UWS
Type spec mass (g):	20.5
Type spec location:	UWB
Main mass:	D. Pitt
Comments:	37.6; submitted by A. Irving

Plots:

O isotopes:

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)
CIW: Carnegie Insitution Washington, Geophysical Laboratory, 5251 Broad Branch Rd., NW, Washington DC 20015, United States (institutional address)
DPitt: Darryl Pitt, 225 West 83rd Street, New York, NY 10024, United States; Website (private address)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015

Find references in NASA ADS:
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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9933 approved meteorites from (Northwest Africa) (plus 1837 unapproved names)

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