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Northwest Africa 5743
Basic information Name: Northwest Africa 5743
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 5743
Observed fall: No
Year found: 2009
Country: (Northwest Africa)
Mass:help 216 g
Meteoritical Bulletin:  MB 99  (2011)  Howardite
Recommended:  Howardite    [explanation]

This is 1 of 453 approved meteorites classified as Howardite.   [show all]
Search for other: Achondrites, HED achondrites, and Howardites
Comments: Approved 14 Dec 2010
Writeup from MB 99:

Northwest Africa 5743 (NWA 5743)

(Northwest Africa)

Purchased: 2009 Feb

Classification: HED achondrite (howardite)

History: Purchased in February 2009 by Adam Hupé from a Moroccan dealer at the Tucson Gem and Mineral Show.

Physical characteristics: A single, uncrusted stone (216 g) containing several varieties of metal-free clasts and distinctive, dark-colored, relatively metal-rich clasts (to 1.5 cm).

Petrography: (A. Irving and S. Kuehner, UWS): Heterogeneous fragmental breccia composed of lithic clasts and various mineral fragments (plagioclase, orthopyroxene, exsolved pigeonite, chromite, taenite). Harzburgitic diogenite clasts (~30 vol%) consist of subequal amounts of olivine and low-Ca pyroxene with accessory chromite and troilite. Metal-rich ultramafic clasts (~30 vol%) consist of strongly-zoned olivine and low-Ca pyroxene with 10-15 vol.% metal (kamacite with minor taenite). Sporadic basaltic eucrite clasts consist of prismatic exsolved pigeonite grains, plagioclase laths, clinopyroxene, silica polymorph, chromite, ilmenite, zircon, troilite and Ni-free kamacite.

Geochemistry: Metal-rich ultramafic clast - olivine (core Fa8.7, FeO/MnO = 59.9, rim Fa35.0, FeO/MnO = 42.9), low-Ca pyroxene (Fs23.2-30.7Wo1.8-2.1, FeO/MnO = 31.6-33.9); harzburgitic diogenite clast - olivine (Fa28.0, FeO/MnO = 52.9), low-Ca pyroxene (Fs22.5Wo2.0, FeO/MnO = 29.3); basaltic eucrite clast - low-Ca pyroxene host (Fs61.3Wo3.0, FeO/MnO = 29.6), Ca-pyroxene (Fs32.6Wo38.2, FeO/MnO = 32.4), plagioclase (An87.2Or0.6). Discrete plagioclase mineral clasts are An86.3-90.5Or0.5-0.3. Oxygen isotopes (D. Rumble, CIW): duplicate analyses of acid-washed samples by laser fluorination gave the following results for different components. Basaltic eucrite clast: δ18O = 3.41, 3.41; δ17O = 1.53, 1.52; Δ17O = -0.261, -0.273 per mil. Metal-rich ultramafic clast: δ18O = 3.55, 3.24; δ17O = 1.60, 1.44; Δ17O = -0.266, -0.261 per mil.

Classification: Achondrite (howardite). This breccia is unusual in containing diverse material related to harzburgitic diogenite, cumulate eucrite, basaltic eucrite, and metal-rich ultramafic lithologies. Little, if any, olivine-free diogenitic material appears to be present. The metal-rich ultramafic clasts have oxygen isotope compositions typical for eucrites and diogenites, yet their constituent olivine grains have unusually magnesian cores.

Specimens: 20.1 g and one polished thin section of a complete slice are on deposit at UWS. AHupé holds the main mass.

Data from:
  Table 0
  Line 0:
Origin or pseudonym:Northwest Africa
Place of purchase:Tucson
Date:P 2009 Feb
Mass (g):216
Shock stage:low
Weathering grade:low
Fayalite (mol%):8.7; 35.0; 28.0
Ferrosilite (mol%):23.2-30.7; 22.5; 61.3; 22.5
Wollastonite (mol%):1.8-2.1; 2.0; 3.0; 38.2
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):20.1
Type spec location:UWS
Main mass:AHupé
Comments:Submitted by A. Irving
Plots: O isotopes:  
   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)
AHupé: Adam C. Hupé, 2807 China Cove, Laughlin, NV 89029, United States; Website (private address; updated 29 Jun 2013)
CIW: Carnegie Insitution Washington, Geophysical Laboratory, 5251 Broad Branch Rd., NW, Washington DC 20015, United States (institutional address)
References: Published in Meteoritical Bulletin, No. 99, April 2012, MAPS 47, E1-E52 (2012) [published online only]
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     This is 1 of 9829 approved meteorites from (Northwest Africa) (plus 1851 unapproved names)

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