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Northwest Africa 15858
Basic information Name: Northwest Africa 15858
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15858
Observed fall: No
Year found: 2021
Country: Mauritania
Mass:help 163 g
Meteoritical Bulletin:  MB 112  (2023)  LL4
Recommended:  LL4    [explanation]

This is 1 of 400 approved meteorites classified as LL4.   [show all]
Search for other: LL chondrites, LL chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 15 Oct 2023
Writeup from MB 112:

Northwest Africa 15858 (NWA 15858)

Erg Chech, Mauritania

Find: 21 Feb 2021

Classification: Ordinary chondrite (LL4)

History: A single piece was found by meteorite researchers from Mauritania in the Erg Chech region of the Mauritanian Sahara. It was subsequently purchased by Ali Muftah and Younes Chaoui in April 2021 who sold it to Sean Mahoney.

Physical characteristics: One single piece with remnant fusion crust covering one side making up approximately 70% of the surface, the remaing part being desert varnished. The main mass is in the collection of Sean Mahoney.

Petrography: (D. Sheikh, Cascadia) Sample is an ordinary chondrite containing accessory Fe-Ni metal, troilite, and chromite.

Geochemistry: Olivine (Fa32.0±1.5, range Fa29.3-36.1, n=23), Low-Ca Pyroxene (Fs26.7±2.6Wo2.2±0.8, range Fs21.6-33.7Wo1.4-3.6, n=20).

Classification: Ordinary Chondrite (LL4)

Specimens: 21.4 g at Cascadia, main mass with Sean Mahoney.

Data from:
  Table 0
  Line 0:
State/Prov/County:Erg Chech
Origin or pseudonym:North Mauritania, close to Algeria
Date:21 Feb 2021
Mass (g):163
Shock stage:S2
Weathering grade:W3
Fayalite (mol%):32.0±1.5
Ferrosilite (mol%):26.7±2.6
Wollastonite (mol%):2.2±0.8
Classifier:D. Sheikh, Cascadia
Type spec mass (g):21.4
Type spec location:Cascadia
Main mass:Sean Mahoney
Finder:Meteorite Researchers (Mauritanian)
Comments:CML 1552; OSM013; Discovered whilst searching for additional pieces of a CK that had been recently found in the surrounding area.; 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 Meteoritical Bulletin, no. 112, in preparation (2023)
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     This is the only approved meteorite from Erg Chech, Mauritania
     This is 1 of 225 approved meteorites from Mauritania (plus 2 unapproved names) (plus 2 impact craters)

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