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Northwest Africa 15118
Basic information Name: Northwest Africa 15118
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15118
Observed fall: No
Year found: 2021
Country: Algeria
Mass:help 230 g
Classification
  history:
Meteoritical Bulletin:  MB 112  (2023)  Achondrite-ung
Recommended:  Achondrite-ung    [explanation]

This is 1 of 150 approved meteorites classified as Achondrite-ung.   [show all]
Search for other: Achondrites, Ungrouped achondrites
Comments: Approved 4 Mar 2023
Writeuphelp
Writeup from MB 112:

Northwest Africa 15118 (NWA 15118)

Algeria

Find: 2021

Classification: Ungrouped achondrite

History: Purchased by Xu dengqin in 2022, reportedly found in Algeria 2021.

Physical characteristics: The meteorite is a single stone, weighing 230 grams, with one broken surface. The rest of the surface is covered with a white to light green translucent fusion crust with shrinkage cracks. The surface of the stone is covered with terrestrial clay.

Petrography: The meteorite is a fragmental breccia composed of mineral clasts of anorthite (up to 6 mm of grain size), orthopyroxene (up to about 100 µm), rare clinopyroxene, chromite, olivine and troilite. Anorthite is the dominant mineral, composed of over 94 vol% of the meteorite. Orthopyroxene is the second most abundant (~6 vol%) mineral in the meteorite. There are no exsolution lamellae of clinopyroxene in orthopyroxene. Minor clinopyroxene only occurs as veins (several to 10 µm in width) in large anorthite grains. Olivine is fairly rare, and only three grains with sizes range in 50-200 µm were observed in two observed sections. Chromite is present with less than 1 vol% in the meteorite and one to a few tens of µm in size.

Geochemistry: Plagioclase An95.7±0.6Ab4.1±0.6, n=52; orthopyroxene En72.8±0.9Fs24.8±0.9Wo2.4±0.1, Fe/Mn=28.9±1.5, Mg#=74.6±0.9, n=46; clinopyroxene En44.2±1.6Fs10.0±0.7Wo45.8±1.4, Fe/Mn=21.7±3.3, Mg#=81.5±1.4, n=10; olivine Fa31.2±0.9, Fe/Mn=46.1±1.1, Mg#=68.5±0.7, n=10; chromite Chr69.2±2.9Spl27.0±2.9Usp3.8±1.4, Mg#=17.1±1.6, n=18. Oxygen isotopes Cao Xiaobin, Nanjing University): 3 acid-washed fragments analyzed by laser fluorination gave average δ18O= 3.770±0.111, δ17O=1.717±0.070, Δ17O=-0.243±0.014 (all per mil).

Classification: Achondrite, ungrouped

Data from:
  MB112
  Table 0
  Line 0:
Date:2021
Mass (g):230
Pieces:1
Class:Achondrite-ung
Fayalite (mol%):31.2±0.9 (n=10)
Ferrosilite (mol%):24.8±0.9 (n=46)
Wollastonite (mol%):2.4±0.1(n=46)
Classifier:Li Shijie, IGCAS
Type spec mass (g):20
Type spec location:IGCAS
Main mass:Xu Dengqin
Finder:anonymous
Comments:Submitted by Li shijie
Plots: O isotopes:  
Institutions
   and collections
USP: Museu de Geociências - USP Rua do Lago, 562 CEP: 05508-080 Butantã - SP Brazil, Brazil; Website (institutional address; updated 16 Feb 2024)
IGCAS: Institute of Geochemistry Chinese Academy of Sciences, Guiyang, China (institutional address; updated 27 Mar 2018)
Catalogs:
References: Published in Meteoritical Bulletin, no. 112, in preparation (2023)
Find references in NASA ADS:
Find references in Google Scholar:
Photos:
CreditPhotos
Public domain photographs:
Li Shijie         
Geography:

Algeria
Coordinates:Unknown.

Statistics:
     This is 1 of 1356 approved meteorites from Algeria (plus 30 unapproved names) (plus 4 impact craters)

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