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Northwest Africa 15859
Basic information Name: Northwest Africa 15859
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15859
Observed fall: No
Year found: 2021
Country: Algeria
Mass:help 25.4 g
Meteoritical Bulletin:  MB 112  (2024)  Lunar (feldsp. breccia)
Recommended:  Lunar (feldsp. breccia)    [explanation]

This is 1 of 341 approved meteorites classified as Lunar (feldsp. breccia).   [show all]
Search for other: Lunar meteorites
Comments: Approved 29 Sep 2023
Writeup from MB 112:

Northwest Africa 15859 (NWA 15859)

Erg Chech, Algeria

Find: 1 Mar 2021

Classification: Lunar meteorite (feldspathic breccia)

History: A single piece was found by hunters in the Sahara, close to the town of Tindouf, Algeria. A thorough search of the surrounding area revealed no further pieces. It was subsequently purchased by Ali Muftah in May 2021 who gave it to Sean Mahoney.

Physical characteristics: One single piece with fusion crust covering one oriented side making up approximately 50% of the surface. The main mass is in the collection of Sean Mahoney.

Petrography: (D. Sheikh, Cascadia) Fragmental breccia comprised of mm to cm-sized lithic and mineral clasts set within a dark, fine-grained matrix. Lithic clast lithologies identified include anorthosites, noritic anorthosites, troctolitic anorthosites, and impact melt-rich clasts. Accessory phases identified include ilmenite and merrillite.

Geochemistry: Olivine (Fa40.2±10.0, range Fa24.9-54.1, Fe/Mn=89±11, n=10), Low-Ca Pyroxene (Fs32.2±4.6Wo3.5±0.4, range Fs24.7-39.1Wo3.1-4.1, Fe/Mn=56±3, n=6), Pigeonite (Fs30.4±7.1Wo9.3±3.6, range Fs25.4-35.4Wo6.8-11.8, Fe/Mn=59±2, n=2), Calcic Plagioclase (An95.5±1.5, range An91.2-97.6, n=15).

Classification: Lunar (feldspathic fragmental breccia).

Specimens: 5.2 grams at Cascadia, main mass with Sean Mahoney.

Data from:
  Table 0
  Line 0:
State/Prov/County:Erg Chech
Origin or pseudonym:Nearby to Tindouf
Date:1 Mar 2021
Mass (g):25.4
Class:Lunar (feldsp. breccia)
Shock stage:moderate
Weathering grade:moderate
Fayalite (mol%):40.2±10.0
Ferrosilite (mol%):32.2±4.6, 30.4±7.1
Wollastonite (mol%):3.5±0.4, 9.3±3.6
Classifier:D. Sheikh, Cascadia
Type spec mass (g):5.2
Type spec location:Cascadia
Main mass:Sean Mahoney
Comments:CML 1589; OSM014; submitted by Daniel Sheikh
   and collections
Cascadia: Cascadia Meteorite Laboratory, Portland State University, Department of Geology, Room 17 Cramer Hall, 1721 SW Broadway, Portland, OR 97201, United States; Website (institutional address; updated 28 Oct 2011)
References: Published in Gattacceca J., McCubbin F. M., Grossman J. N., Schrader D. L., Cartier C., Consolmagno G., Goodrich C., Greshake A., Gross J., Joy K. H., Miao B. and Zhang B. (2024) The Meteoritical Bulletin, no. 112. Meteoritics & Planetary Science 59, 1820–1823. ?
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     This is the only approved meteorite from Erg Chech, Algeria
     This is 1 of 1374 approved meteorites from Algeria (plus 31 unapproved names) (plus 4 impact craters)

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