NWA 17031

 

NWA 17031

Found Sahara, 2024

Achondrite

Ureilite

Specimen is a 2.27g slice



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Basic information
  Name: Northwest Africa 17031 This is an OFFICIAL meteorite name.
Abbreviation: NWA 17031
Observed fall: No
Year found: 2024
Country: (Northwest Africa)
Classification history:
  Meteoritical Bulletin, MB 113 (2025): Ureilite
Recommended: Ureilite    [explanation]
Writeup Writeup from MB 113:

Northwest Africa 17031 (NWA 17031)

(Northwest Africa)

Purchased: 2024

Classification: Ureilite

History: Reportedly found in Algeria in January 2024 and bought later in Mauritania by Mohamed Ali Loud from Al Bouhali Mahmoud-Hamadat

Petrography: (K. Metzler, IfP) Coarse-grained ultramafic rock, consisting of olivine and pyroxene grains with sizes up to several mm. Reduction features in olivine, i. e., reverse zoning and occurrence of tiny Ni-free metals at the margins, along cracks, and within the grains. Graphite occurs along silicate grain boundaries.

Geochemistry: Mineral compositions and geochemistry: Mean mineral chemistry: Olivine cores: Fa20.7±0.2 (Fa20.4-21.1); Fe/Mn (at.): 50.3; CaO: 0.4 wt% (n=12). Low-Ca pyroxene: Fs17.1±0.2 Wo9.1±0.2 (Fs16.9-17.6 Wo8.7-9.4); n=13. The mean concentration of Cr2O3 (wt%) in olivine and pyroxene is 0.6 and 1.3, respectively.

Classification: Ureilite, based on modal composition, mineral chemistry, occurrence of considerable amounts of graphite, and typical reduction features in olivine.

Specimens: 20 g including a thin section on deposit at IfP. Mohamed Ali Loud holds the main mass.

Data from: MB114
Table 0 Line 0:
Place of purchase: Mauritania
Date: P 2024
Mass (g): 4200
Pieces: Many
Class: Ureilite
Shock stage: U-S2
Weathering grade: moderate
Fayalite (mol%): 20.7±0.2
Ferrosilite (mol%): 17.1±0.2
Wollastonite (mol%): 9.1±0.2
Classifier: K. Metzler, IfP
Type spec mass (g): 20
Type spec location: IfP
Main mass: Mohamed Ali Loud
Comments: Submitted by K. Metzler, IfP
Institutions and collections
  IfP: Institut für Planetologie, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany (institutional address; updated 2012-01-23)

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The WWMeteorites team (for "WorldWide Meteorites" - Meteorites from around the world) was created in 2003 with the primary goal of traveling around globe in search of these fascinating celestial objects, and make them available for Science... and Collectors. Since 2017, the team has established its base camp on the island of Unst (Shetland, UK).

With four or five trips per year on average, the number of finds (in countries as diverse as Tunisia, Spain, Qatar, the Sultanate of Oman ...) has quickly become important. WWMeteorites therefore collaborates with several laboratories that analyze, and classify the new meteorites, mainly the Museum Fur Naturkunde (Berlin), the CEREGE (University of Aix-Marseille), and the Appalacjain State University (North Carolina). WWmeteorites (under the name of its founder, Fabien Kuntz.)  have already more than 500 meteorites listed in the Meteoritical Society Database.

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