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Northwest Africa 16180
Basic information Name: Northwest Africa 16180
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 16180
Observed fall: No
Year found: 2022
Country: (Northwest Africa)
Mass:help 3.58 kg
Meteoritical Bulletin:  MB 112  (2023)  L3-5
Recommended:  L3-5    [explanation]

This is 1 of 24 approved meteorites (plus 1 unapproved name) classified as L3-5.   [show all]
Search for other: L chondrites, L chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 3 Sep 2023
Writeup from MB 112:

Northwest Africa 16180 (NWA 16180)

(Northwest Africa)

Purchased: 2022

Classification: Ordinary chondrite (L3-5)

History: Purchased in 2022 by Mustapha Oulkouch from Ali Naji in Guelmim, Morocco.

Physical characteristics: Single stone with dark brown fusion crust.

Petrography: (D. Sheikh, Cascadia) Sample is a genomict breccia comprised of chondrules (Av. ~700 μm) and mm-sized sub-angular clasts set within a fine-grained matrix. Multiple lithologies are present in this sample: 1) A Type 5 lithology containing equilibrated olivine/low-Ca pyroxene and secondary recrystallized feldspar (Av. ~25 μm), 2) A Type 4 lithology containing equilibrated olivine, unequilibrated low-Ca pyroxene, and devitrified glass, and 3) A Type 3 lithology containing unequilibrated olivine/low-Ca pyroxene. Accessory phases identified include Fe-Ni metal, troilite, and chromite.

Geochemistry: Type 3 Unequilibrated Olivine (Fa22.5±6.8, range Fa10.9-31.0, n=7), Type 4-5 Equilibrated Olivine (Fa25.2±0.3, range Fa24.3-25.8, n=33), Type 3-4 Unequilibrated Low-Ca Pyroxene (Fs9.4±5.8Wo0.9±0.8, range Fs3.4-22.5Wo0.3-3.0, n=16), Type 5 Equilibrated Low-Ca Pyroxene (Fs21.1±0.5Wo1.6±0.4, range Fs20.1-22.1Wo0.4-2.4, n=26).

Classification: Ordinary Chondrite (L3-5).

Specimens: 39.7 g at Cascadia (33.1 g in two pieces, remaining material is in an epoxy stub), main mass with Mustapha Oulkouch and Abdelkbir Oulgour.

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2022
Mass (g):3575
Shock stage:S3
Weathering grade:W2
Fayalite (mol%):25.2±0.3; 22.5±6.8
Ferrosilite (mol%):21.1±0.5; 9.4±5.8
Wollastonite (mol%):1.6±0.4; 0.9±0.8
Classifier:D. Sheikh, Cascadia
Type spec mass (g):39.7
Type spec location:Cascadia
Main mass:Mustapha Oulkouch and Abdelkbir Oulgour
Comments:CML 1664; 4MO.AO; 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)
Find references in NASA ADS:
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     This is 1 of 9765 approved meteorites from (Northwest Africa) (plus 1865 unapproved names)

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