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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:
Meteoritical Bulletin:  MB 111  (2023)  Martian (shergottite)
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 319 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 Gattacceca J., McCubbin F. M., Grossman J. N., Schrader D. L., Chabot N. L., D’Orazio M., Goodrich C., Greshake A., Gross J., Joy K. H., Komatsu M. and Miao B. (2023) The Meteoritical Bulletin, No. 111. Meteoritics & Planetary Science 58, 901–904. ?
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Geography:

Algeria
Coordinates:Unknown.

Statistics:
     This is 1 of 1344 approved meteorites from Algeria (plus 30 unapproved names) (plus 4 impact craters)
Also see:
  This lists the most popular meteorites among people who looked up this meteorite.
Revision
  history:
  This lists important revisions made to data for this record.

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