NWA 18634

 

NWA 18634

Found Sahara, 2025

Achondrite

Diogenite, polymicte

Specimen is a 2.35g slice



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Basic information Name: Northwest Africa 18634
Abbreviation: NWA 18634
Observed fall: No
Year found: 2025
Country: (Northwest Africa)
Mass: 140.6g
Classification history: Recommended: Diogenite-pm

This is 1 of 76 approved meteorites classified as Diogenite-pm.    [show all]
Writeup Writeup from MB 115:

Northwest Africa 18634 (NWA 18634)

(Northwest Africa)

Purchased: 2025 Jun

Classification: HED achondrite (Diogenite, polymict)

Physical characteristics: A single roundish stone with patches of fusion crust.

Petrography: (J. Gattacceca, CEREGE) Igneous rock with a brecciated subophitic texture and grain size ~250 µm. Gabbroic lithic clasts are present. Main minerals are pyroxene and plagioclase (~12 vol%). Some pyroxene grains are exsolved. Accessory minerals: olivine, chromite, ilmenite, metal, troilite. A melt rock lithology is present, making about half of the type specimen. It shows a straight contact with the subophitic lithology.

Geochemistry: (J. Gattacceca, electron probe microanalyses at CAMPARIS) Orthopyroxene Fs28.1±9.1Wo2.5±0.6, range Fs21.4-52.1, FeO/MnO = 33.2±4.8. Pigeonite Fs41.8±5.1Wo15.3±7.6, FeO/MnO = 31.1±2.8 (n=3). Plagioclase An83.6±4.5Ab17.8±4.2Or0.6±0.4 (n=4). Olivine Fa35.3, FeO/MnO = 56.5 (n=1). Gabbroic lithic clast: low-Ca pyroxene Fs50.5±4.0Wo8.5±4.1, FeO/MnO 27.5±1.8 (n=3), Plagioclase An89.1Ab10.6Or0.3 (n=2). Melt rock: olivine Fa35.3±0.1, FeO/MnO 56.4±2.4 (n=3), orthopyroxene Fs23.9±2.9Wo1.8±0.3, FeO/MnO 32.2±5.4 (n=5).

Classification: HED achondrite (noritic diogenite, polymict). The gabbroic clast with eucritic composition make up less than 10 vo% of the meteorite.

Specimens: Type specimen at CEREGE. Main mass with Kuntz.

Data from: MB114
Table 0 Line 0:
Place of purchase: Ensisheim, France
Date: P 2025 Jun
Mass (g): 140.6
Pieces: 1
Class: Diogenite-pm
Weathering grade: low
Fayalite (mol%): 35.3 (n=1)
Ferrosilite (mol%): 28±1±9.1 (n=9)
Wollastonite (mol%): 2.48±0.56
Magnetic suscept.: 3.23
Classifier: J. Gattacceca, CEREGE
Type spec mass (g): 22.4
Type spec location: CEREGE
Main mass: Kuntz
Finder: anonymous
Comments: work name K621; submitted by Jerome Gattacceca
Institutions and collections
  CEREGE: CEREGE BP 80 Avenue Philibert, Technopole de l'Arbois 13545 Aix-en-Provence Cedex 4 France, France (institutional address; updated 2023-06-10)
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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