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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:help 56 g
Meteoritical Bulletin:  MB 100  (2012)  Achondrite-ung 
Recommended:  Achondrite-ung    [explanation]

This is 1 of 155 approved meteorites classified as Achondrite-ung.   [show all]
Search for other: Achondrites, Ungrouped achondrites
Comments: Approved 18 Feb 2012
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 Fa29.9-30.3, Fe/Mn=63-66; clinopyroxene Fs9.8-10.0Wo43.5-43.7, Fe/Mn=33-42; orthopyroxene Fs24.1±0.05Wo2.1-2.2, 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:
  Table 1
  Line 1251:
Place of purchase:Erfoud
Date:P Sept 2008
Mass (g):56
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:  
   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)
References: Published in Meteoritical Bulletin, no. 100, MAPS 49, E1-E101 (2014)
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     This is 1 of 9772 approved meteorites from (Northwest Africa) (plus 1862 unapproved names)

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