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Northwest Africa 17031
Basic information Name: Northwest Africa 17031
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 17031
Observed fall: No
Year found: 2024
Country: (Northwest Africa)
Mass:help 4.2 kg
Classification
  history:
Recommended:  Ureilite    [explanation]

This is 1 of 676 approved meteorites classified as Ureilite.   [show all]
Search for other: Achondrites, Ureilites
Comments: Approved 21 Sep 2024
Writeuphelp
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:
  MB113
  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 23 Jan 2012)
Catalogs:
References: Published in Meteoritical Bulletin, no. 113, in preparation (2024)
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Photos:
CreditPhotos
Public domain photographs:
Knut Metzler      
Geography: 
Coordinates:Unknown.

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

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