NWA 18322

 

NWA 18322

Found Sahara, 2025

Achondrite

Diogenite

Specimen is a 3.37g slice



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"Igneous rock with granoblastic texture and grain size of 400 µm. A 6 mm pyroxene crystal containing 50 µm FeNi/FeS composite grains and 50 µm chromite grains was observed."

 

Basic information Name: Northwest Africa 18322 This is an OFFICIAL meteorite name.
Abbreviation: NWA 18322
Observed fall: No
Year found: 2025
Country: (Northwest Africa)
Mass: 134.1 g
Classification history:
  Recommended: Diogenite
Writeup Writeup from MB 115:

Northwest Africa 18322 (NWA 18322)

(Northwest Africa)

Purchased: 2025 Jun

Classification: HED achondrite (Diogenite)

Physical characteristics: A single stone without fusion crust.

Petrography: (J. Gattacceca, CEREGE) Igneous rock with granoblastic texture and grain size of 400 µm. The main mineral is pyroxene. Olivine and plagioclase are present. Accessory minerals: chromite up to 400 µm, troilite to up 400 µm, metal. A 6 mm pyroxene crystal containing 50 µm FeNi/FeS composite grains and 50 µm chromite grains was observed.

Geochemistry: (J. Gattacceca, electron probe microanalyses at CAMPARIS) Orthopyroxene Fs24.1±0.2Wo3.5±0.1, FeO/MnO 30.4±5.1 (n=3). Olivine Fa29.6, FeO/MnO 55.4 (n=2). Plagioclase An89.5Ab10.3Or0.2 (n=1). Chromite Cr# 0.66 (n=1).

Data from: MB114
Table 0 Line 0:
Place of purchase: Ensisheim, France
Date: P 2025 Jun
Mass (g): 134.15
Pieces: 1
Class: Diogenite
Weathering grade: low
Fayalite (mol%): 29.6 (n=2)
Ferrosilite (mol%): 24.1±0.2 (n=3)
Wollastonite (mol%): 3.5±0.1
Magnetic suscept.: 3.50
Classifier: J. Gattacceca, CEREGE
Type spec mass (g): 24.2
Type spec location: CEREGE
Main mass: Kuntz
Finder: anonymous
Comments: work name K620; 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
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