Meteoritical Bulletin: Entry for Northwest Africa 5548

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Northwest Africa 5548

Basic information

Name: Northwest Africa 5548
This is an OFFICIAL meteorite name.
Abbreviation: NWA 5548
Observed fall: No
Year found: 2008
Country: (Northwest Africa)
Mass: 56 g

Classification
history:

Meteoritical Bulletin:	MB 100	(2012)	Achondrite-ung
Recommended:			Achondrite-ung [explanation]

This is 1 of 131 approved meteorites classified as Achondrite-ung. [show all]
Search for other: Achondrites, Ungrouped achondrites

Comments:

Approved 18 Feb 2012

Writeup

help

Writeup from MB 100:

Northwest Africa 5548 (NWA 5548)

(Northwest Africa)

Purchased: Sept 2008

Classification: Ungrouped achondrite

History: Purchased in 2008 September by Thomas Webb from a Moroccan dealer in Erfoud.

Physical characteristics: A single dark brown stone weighing 56 g.

Petrography: Protogranular texture. Composed predominantly of olivine with accessory clinopyroxene, orthopyroxene, chromite, altered kamacite, and minor chlorapatite and Mg-bearing merrillite. Plagioclase is absent.

Geochemistry: Olivine Fa_29.9-30.3, Fe/Mn=63-66; clinopyroxene Fs_9.8-10.0Wo_43.5-43.7, Fe/Mn=33-42; orthopyroxene Fs_24.1±0.05Wo_2.1-2.2, Fe/Mn=36-40. Oxygen isotopes (D. Rumble, CIW): analyses of acid-washed subsamples by laser fluorination gave, respectively δ¹⁷O = 2.69, 2.72; δ¹⁸O = 5.00, 5.08; Δ¹⁷O = 0.056, 0.046 per mil.

Classification: Achondrite (brachinite-like, ungrouped). Paired with NWA 5400, 6077, 6172, 6292, 6424, 5363, and 6572.

Specimens: A total of 2.7 g and one polished thin section are on deposit at UWS; a further 11 g and one thin section are on deposit at BathO. TWebb holds the main mass.

Data from:
  MB100
  Table 1
  Line 1251:

Place of purchase:	Erfoud
Date:	P Sept 2008
Mass (g):	56
Pieces:	1
Class:	Achondrite-ung
Shock stage:	low
Weathering grade:	moderate
Fayalite (mol%):	29.9-30.3
Ferrosilite (mol%):	9.8-10.0; 24.1±0.05
Wollastonite (mol%):	43.5-43.7; 2.1-2.2
Classifier:	A. Irving and S. Kuehner, UWS
Type spec mass (g):	13.7
Type spec location:	2.7 g UWS; 11 g BathO
Main mass:	TWebb
Comments:	Submitted by A. Irving

Plots:

O isotopes:

Institutions
and collections

BathO: Bathurst Observatory Research Facility, 624 Limekilns Road, Kelso NSW 2795, Australia (institutional address; updated 27 Jul 2012)
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
CIW: Carnegie Insitution Washington, Geophysical Laboratory, 5251 Broad Branch Rd., NW, Washington DC 20015, United States (institutional address)
TWebb: No contact information provided., United States (private address)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 100, MAPS 49, E1-E101 (2014)

Find references in NASA ADS:
Find references in Google Scholar:

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9111 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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