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Northwest Africa 15156
Basic information Name: Northwest Africa 15156
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15156
Observed fall: No
Year found: 2022
Country: Algeria
Mass:help 191 g
Classification
  history:
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 284 approved meteorites (plus 2 unapproved names) classified as Martian (shergottite).   [show all]
Search for other: Martian meteorites
Comments: Approved 6 Aug 2022
Writeuphelp
Writeup from MB 111:

Northwest Africa 15156 (NWA 15156)

Algeria

Purchased: 2022

Classification: Martian meteorite (Shergottite)

History: Purchased from a North African meteorite dealer in 2022.

Physical characteristics: Sand blasted exterior with no fusion crust, a polished saw cut reveals dark brown, high relief olivine phenocrysts set in a fine-grained light gray groundmass. Small shiny maskelynite grains are macroscopically visible.

Petrography: (A. Ross and C. Agee, UNM) This meteorite has the approximate modal abundances: 55% pigeonite, 20% olivine, 10% maskelynite, with accessory ilmenite, chromite, Ti-Cr spinel, titanomagnetite, low Ni Fe-metal, and troilite. Pigeonite shows a correlated calcium-iron enrichment trend. Olivine phenocrysts show a wide compositional range due to zoning. Maskelynite is usually observed occupying pyroxene and olivine grain boundary pockets.

Geochemistry: (A. Ross, UNM) Olivine Fa38.2±17.0, Fe/Mn=53±4, CaO=0.27±0.06, (wt%), n=7; pyroxene Fs28.9±3.3Wo11.7±4.5, Fe/Mn=30±2, n=12; maskelynite An62.2±1.6Ab37.3±1.3Or0.5±0.3, n=4.

Classification: Martian shergottite (olivine phyric basalt).

Specimens: 20.25 g on deposit at UNM, Mark Lyon holds the main mass.

Data from:
  MB111
  Table 0
  Line 0:
Date:P 2022
Mass (g):191
Pieces:1
Class:Martian (shergottite)
Shock stage:high
Weathering grade:moderate
Fayalite (mol%):38.2±17.0
Ferrosilite (mol%):28.9±3.3
Wollastonite (mol%):11.7±4.5
Classifier:C. Agee, UNM
Type spec mass (g):20.25
Type spec location:UNM
Main mass:Mark Lyon
Comments:Field name ML-35; submitted by C. Agee
Institutions
   and collections
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
Catalogs:
References: Published in Meteoritical Bulletin, no. 111, in preparation (2022)
Find references in NASA ADS:
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Geography:

Algeria
Coordinates:Unknown.

Statistics:
     This is 1 of 1223 approved meteorites from Algeria (plus 29 unapproved names) (plus 4 impact craters)

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