Northwest Africa 13917

Name: Northwest Africa 13917
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13917
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass: 5.2 kg

Meteoritical Bulletin:   (2022)  Winonaite
Recommended:  Winonaite 
This is 1 of 98 approved meteorites classified as Winonaite.   

Approved 6 May 2021

Northwest Africa 13917 (NWA 13917)

(Northwest Africa)

Purchased: 2020

Classification: Primitive achondrite (Winonaite)

History: Purchased from Morocco in September 2020 and January 2021.

Physical characteristics: Several identical appearing stones found together -- the largest of which are individuals weighing 1.6 kg, 1.4 kg, and 1.2 kg. Saw-cut surface shows abundant fine-grained metal and sulfide set in a mosaic of brown and gray silicate minerals. A prominent metal vein 2 mm thick and several cm in length crosscuts the deposit sample slice.

Petrography: Microprobe examination of a polished mount shows a texturally equilibrated mosaic of enstatite and diopside with grain size in the range 100-300 μm, many triple junctions are present. Forsterite is ubiquitous but is significantly less abundant than the pyroxenes. Kamacite, taenite, and troilite make up approximately 10% of this meteorite, most grains are 100-300 μm in diameter. A phosphate phase was detected. No feldspar was observed in the microprobe mount.

Classification: Primitive achondrite (Winonaite)

Specimens: 67.9 g on deposit at UNM. Mark Lyon holds the main masses.

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