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Northwest Africa 16400
Basic information Name: Northwest Africa 16400
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 16400
Observed fall: No
Year found: 2023
Country: (Northwest Africa)
Mass:help 50 g
Classification
  history:
Recommended:  Lunar    [explanation]

This is 1 of 108 approved meteorites classified as Lunar.   [show all]
Search for other: Lunar meteorites
Comments: Approved 4 Jan 2024
Writeuphelp
Writeup from MB 113:

Northwest Africa 16400 (NWA 16400)

(Northwest Africa)

Purchased: 2023

Classification: Lunar meteorite

History: Purchased in 2023 by Habib-naji Naji from a meteorite dealer in Algeria.

Physical characteristics: Single stone with minor fusion crust.

Petrography: (D. Sheikh, Cascadia) Sample represents a fragmental breccia comprised of mm-sized angular to sub-rounded lithic and mineral clasts set within a mostly fine-grained matrix. Clast lithologies identified in this sample include anorthosites, norites, olivine gabbronorites, anorthositic gabbronorites, troctolites, pink spinel anorthosites (PSA), impact melt clasts, and other spinel-bearing lithologies; clast lithologies are predominantly Mg-suite in composition, with minor input from lunar ferroan anorthosites (FAN) and magnesian anorthosites (MAN). Minor/accessory phases identified include ilmenite, cordierite, troilite, Fe-Ni metal, chromite, and merrillite.

Geochemistry: Host [Olivine (Fa19.7±8.4, range Fa7.7-27.2, Fe/Mn=85±7, n=17); Low-Ca Pyroxene (Fs11.5±0.7Wo2.0±1.8, range Fs10.2-12.8Wo0.5-4.8, Fe/Mn=47±8, n=30), Pigeonite (Fs18.8±1.2Wo14.3±3.6, range Fs16.8-21.4Wo8.7-21.5, Fe/Mn=50±5, n=9), High-Ca Pyroxene (Fs9.4±3.9Wo38.8±5.5, range Fs5.0-15.2Wo26.6-44.4, Fe/Mn=41±10, n=18), Calcic Plagioclase (An95.2±2.3, range An89.6-98.2, n=68)]; Pink Spinel Anorthosite (PSA) Clasts [Pink Spinel (Mg#=84.0±0.2, Cr#=3.9±0.1, n=18), Calcic Plagioclase (An95.6±0.4, range An94.8-96.2, n=21)].

Classification: Lunar. Likely paired with NWA 15500 based on texture and clast lithologies.

Specimens: 11.3 g type specimen at Cascadia, main mass, D. Shiekh.

Data from:
  MB113
  Table 0
  Line 0:
Place of purchase:Algeria
Date:P 2023
Mass (g):50
Pieces:1
Class:Lunar
Shock stage:high
Weathering grade:low
Fayalite (mol%):19.7±8.4
Ferrosilite (mol%):11.5±0.7, 18.8±1.2, 9.4±3.9
Wollastonite (mol%):2.0±1.8, 14.3±3.6, 38.8±5.5
Classifier:D. Sheikh, Cascadia
Type spec mass (g):11.3
Type spec location:Cascadia
Main mass:D. Sheikh
Comments:CML 1738; submitted by Daniel Sheikh
Institutions
   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)
Catalogs:
References: Published in Meteoritical Bulletin, no. 113, in preparation (2024)
Find references in NASA ADS:
Find references in Google Scholar:
Photos:
CreditPhotos
Public domain photographs:
Daniel Sheikh      
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9829 approved meteorites from (Northwest Africa) (plus 1851 unapproved names)

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