NWA 18243

 

NWA 18243

Found Sahara, 2025

Achondrite

Ureilite

Specimen is 0.96g, as found



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Northwest Africa 18243
Basic information Name: Northwest Africa 18243
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 18243
Observed fall: No
Year found: 2025
Country: (Northwest Africa)
Mass: 152.9 g
Classification
  history:
Recommended:       Ureilite    
Comments: Approved 23 Dec 2025
Writeup Writeup from MB 114:
Northwest Africa 18243 (NWA 18243)
(Northwest Africa)
Purchased: 2025 Oct
Classification: Ureilite
History: The meteorite was purchased from a dealer in Morocco.
Physical characteristics: Many light brownish rocks lacking fusion crust.
Petrography: Protogranular aggregate predominantly composed of up to 2.5 mm sized olivine and less abundant pigeonite grains both showing characteristic reduced rims associated with fine-grained weakly altered FeNi-metal. Olivine grains often meet in triple junctions. Contains graphite and troilite.
Geochemistry: olivine cores: Fa21.5±0.1 (Fa21.3-21.7, n=10), contain 0.54±0.03 wt% Cr2O3 and 0.20±0.01 wt% CaO; reduced rims in olivine: Fa1.8-3.2, n=3; pyroxene: Fs18.0±0.1Wo9.4±0.1 (Fs17.8-18.2Wo9.2-9.6, n=15), contains 1.16±0.04 wt% Cr2O3 and 1.20±0.03 wt% Al2O3; reduced rims in pyroxene: Fs1.7-2.6Wo4.2-5.2
Data from:
  MB114
  Table 0
  Line 0:
Place of purchase: Morocco
Date: P 2025 Oct
Mass (g): 152.9
Pieces: many
Class: Ureilite
Shock stage: low
Weathering grade: low
Fayalite (mol%): 21.5
Ferrosilite (mol%): 18
Wollastonite (mol%): 9.4
Classifier: A. Greshake, MNB
Type spec mass (g): 24.5
Type spec location: MNB
Main mass: Fabien Kuntz
Comments: Submitted by Ansgar Greshake
Institutions
   and collections
MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 2011-12-24)
Kuntz: Fabien Kuntz, France; Website (private address)

 

 

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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.

In order to have a classification and an official referencement established, as well as to allow the long-term research on the meteorites, a part of 20% of each find by WWmeteorites is deposited in a lab
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