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Northwest Africa 16460
Basic information Name: Northwest Africa 16460
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 16460
Observed fall: No
Year found: 2023
Country: Algeria
Mass:help 450 g
Classification
  history:
Recommended:  Lunar (Basalt)    [explanation]

This is 1 of 29 approved meteorites classified as Lunar (Basalt).   [show all]
Search for other: Lunar meteorites
Comments: Approved 14 Feb 2024
Writeuphelp
Writeup from MB 113:

Northwest Africa 16460 (NWA 16460)

Algeria

Find: 2021

Classification: Lunar meteorite (basalt)

History: Found in the Algeria desert in 2021, three pieces of stone (with a total weight of 450 g) were purchased by JIANG Wei from Khaled Zed in 2023.

Physical characteristics: The stones have a greenish brown color with no fusion crust.

Petrography: Small olivine phenocrysts (up to 150 µm) are sparsely set in an intersertal groundmass composed mainly of elongate, zoned clinopyroxene prisms (up to 2.0 mm) and tabular plagioclase laths (up to 2.0 mm). Olivine phenocrysts contain inclusions of hercynite. Significant fracturing is observed in clinopyroxene and olivine grains, whereas the plagioclase laths show only a limited number of fractures. Augite rims are observed on a few pigeonite grains. Acicular ilmenite grains were ubiquitous in the microprobe mount; Ti-rich chromite, troilite, and silica were also observed. The late-stage mesostasis is composed of silica, K-rich glass, Fe-rich olivine, Fe-rich pyroxene, ilmenite, baddeleyite, apatite, and merrillite. In addition, there are a few patches of shock veins and impact melt pockets. Cracks in the microprobe mount are commonly filled with carbonate/sulphate. Modal mineralogy (vol%): clinopyroxene=59, plagioclase=30, olivine=4, opaques (ilmenite + chromite) = 3, silica=1, other (mesostasis + carbonate/ sulfate)= 3.

Geochemistry: Mineralogy by EPMA. Pyroxene [Fs22.2-76.1Wo19.3-38.9En1.5-49.0 (n=25); Fe/Mn = 37.3-89.7, average: 61±12] and olivine [Fo14.1-63.9; Fa36.1-85.6; Fe/Mn = 86-108, average: 93±7; (n=13)] grains are igneously zoned. Pyroxene plots in the low-Ti mare basalt region and follows the same trend of NWA 10597 on the Ti# (molar Ti/(Ti+Cr)) vs. Fe# (molar Fe/(Fe+Mg)) diagram. Plagioclase is highly calcic, An86.7±1.6Ab13.0±1.6Or0.3±0.1 (An84.6-91.6Ab8.2-15.0Or0.2-0.6, n=31); Chemical compositions (wt.%; by EDS) of impact melt vein: MgO=5.8±0.5, FeO=21.6±1.0, Al2O3=10.2±0.7, SiO2=43.4±0.9, CaO=11.2±0.3, TiO2=5.3±0.7.

Classification: (Mei A., PMO) Lunar basalt

Specimens: 20 g at PMO

Data from:
  MB113
  Table 0
  Line 0:
Origin or pseudonym:Desert
Place of purchase:Yiwu
Date:2021
Mass (g):450
Pieces:3
Class:Lunar (Basalt)
Weathering grade:low
Fayalite (mol%):45.1±14.0 (n=13); 36.1-85.6
Ferrosilite (mol%):42.1±15.7 (n=25); 22.2-76.1
Wollastonite (mol%):26.0±5.9 (n=25); 19.3-38.9
Classifier:Mei A., PMO
Type spec mass (g):20
Type spec location:PMO
Main mass:JIANG Wei
Comments:Submitted by Hsu W.
Institutions
   and collections
PMO: Purple Mountain Observatory, Nanjing, China (institutional address; updated 16 Dec 2011)
Catalogs:
References: Published in Meteoritical Bulletin, no. 113, in preparation (2024)
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Photos:
CreditPhotos
Public domain photographs:
Weibiao Hsu         
Geography:

Algeria
Coordinates:Unknown.

Statistics:
     This is 1 of 1362 approved meteorites from Algeria (plus 31 unapproved names) (plus 4 impact craters)

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