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Northwest Africa 12392
Basic information Name: Northwest Africa 12392
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12392
Observed fall: No
Year found: 2018
Country: (Northwest Africa)
Mass:help 502 g
Classification
  history:
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 191 approved meteorites (plus 1 unapproved name) classified as Martian (shergottite).   [show all]
Search for other: Martian meteorites
Comments: Approved 9 Feb 2019
Writeuphelp
Writeup from MB 108:

Northwest Africa 12392 (NWA 12392)

(Northwest Africa)

Purchased: 2018

Classification: Martian meteorite (Shergottite)

History: Purchased from Rachid Chaoui in Morocco, August 2018.

Physical characteristics: Single stone, lacking fusion crust. Saw cut reveals a mix of brown pyroxene grains and black maskelynite domains and shock melt.

Petrography: (C. Agee, UNM) Igneous rock with diabasic texture. The two major phases in this meteorite are pigeonite and maskelynite. The pigeonite has a modal abundance of approximately 75% and shows significant core to rim zoning in backscatter electron images. No augite was detected. Maskelynite has modal abundance of approximately 20%. Ubiquitous ilmenite and ulvöspinel are present. Shock melt veins with vesicles were observed throughout.

Geochemistry: (C. Agee, UNM) Pigeonite Fs53.5±20.3Wo13.7±6.4, core to rim range Fs26.3Wo4.5 Ð Fs76.3Wo16.8, Fe/Mn=36±5, n=13; maskelynite An51.1±2.0Ab48.0±1.8Or0.9±0.6, n=7; Shock melt (20 μm defocused electron beam) SiO2=50.2±2.0, TiO2=0.81±12, Al2O3=10.2±3.7, Cr2O3=0.13±0.05, MgO=6.0±1.9, FeO=19.9±3.9, MnO=0.47±0.10, NiO=0.02±0.03, CaO=9.8±0.4, Na2O=1.6±0.7, K2O=0.10±0.03 (all wt%), n=7.

Classification: Pigeonite basalt, augite absent.

Specimens: 20.1 g including a probe mount on deposit at UNM, Jay Piatek holds the main mass.

Data from:
  MB108
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2018
Mass (g):502.1
Pieces:1
Class:Martian (shergottite)
Shock stage:high
Weathering grade:moderate
Ferrosilite (mol%):53.5±20.3
Wollastonite (mol%):13.7±6.4
Classifier:C. Agee, UNM
Type spec mass (g):20.1
Type spec location:UNM
Main mass:Jay Piatek
Comments:Field name JP-408; submitted by C. Agee, UNM
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. 108, in preparation (2019)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6877 approved meteorites from (Northwest Africa) (plus 2037 unapproved names)

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