NWA 18297

 

NWA 18297

Found Sahara, 2025

Achondrite

Ungrouped

Specimen is a 2.56g slice



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Basic information Name: Northwest Africa 18297 This is an OFFICIAL meteorite name.
Abbreviation: NWA 18297
Observed fall: No
Year found: 2025
Country: (Northwest Africa)
Mass: 776 g
Classification history: Recommended: Achondrite-ung    [explanation]
Writeup Writeup from MB 115:

Northwest Africa 18297 (NWA 18297)

(Northwest Africa)

Purchased: 2025 Oct

Classification: Ungrouped achondrite

History: Fabien Kuntz purchased many samples weighing a total of 776 g from a dealer in Morocco in October 2025.

Physical characteristics: Stones lack fusion crust. The cut face is dark, orange-brown in color and shows a poikilitic texture.

Petrography: Description and classification (A. Love, App): Sample shows poikiloblastic texture composed of 0.5mm-1cm-sized clinoenstatite, forsterite, augite and twinned plagioclase. Olivine, augite and plagioclase occur as interstitial phases and as chadacrysts. Forsterite also occurs in lumps of equigranular grains interstitial to clinoenstatite oikocrysts. Additional minerals are: troilite, FeNi metal, graphite, schreibersite and daubréelite.

Geochemistry: (A. Love, App) Olivine (Fa1.1±0.1, Fe/Mn=4.2±0.9, n=6); enstatite (Fs1.4±0.3Wo0.8±0.1, Fe/Mn=2.8±0.7 n=6); augite (Fs0.7±0.1Wo40.1±0.2, Fe/Mn=1.8±0.2 n=5); plagioclase (An43.2±0.2Or0.1±0.1, n=5).

Classification: Achondrite (ungrouped). Based on textures, reduced mineral compositions and reduced mineral assemblage, this sample is similar to the ungrouped achondrites Bir Ounane 001, Bir Ounane 003 and Bir Ounane 004. Sample shows U-S2 shock characteristics and W2 weathering.

Specimens: Fabien Kuntz holds the main masses. A polished mount and 7 individuals weighing 26.2g are on deposit at App.

Data from: MB114
Table 0 Line 0:
Place of purchase: Morocco
Date: P 2025 Oct
Mass (g): 776
Pieces: many
Class: Achondrite-ung
Shock stage: U-S2
Weathering grade: W2
Fayalite (mol%): 1.1±0.1
Ferrosilite (mol%): 1.4±0.3; 0.7±0.1
Wollastonite (mol%): 0.8±0.1; 40.1±0.2
Classifier: A. Love, App
Type spec mass (g): 26.2
Type spec location: App
Main mass: Fabien Kuntz
Comments: Submitted by Anthony Love
Institutions and collections
  App: Geological and Environmental Sciences, 572 Rivers St., Appalachian State University, Boone, NC 28608, United States (institutional address; updated 2026-04-28)
Kuntz: Fabien Kuntz, France; Website (private address)

About Us

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
oratory


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