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Northwest Africa 10818
Basic information Name: Northwest Africa 10818
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 10818
Observed fall: No
Year found: 2016
Country: (Northwest Africa)
Mass:help 166.2 g
Meteoritical Bulletin:  MB 105  (2016)  Martian (shergottite)
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 24 Sep 2016
Writeup from MB 105:

Northwest Africa 10818 (NWA 10818)

(Northwest Africa)

Purchased: April 2016

Classification: Martian meteorite (Shergottite)

History: Found by meteorite hunters at the Mauritanian/Algerian border region.

Physical characteristics: Weathered exterior. A saw cut reveals a fine-grained, green-brown interior, some grains up to ~1 mm. A single, dark, shock melt vein was present in the deposit sample, ~0.25 mm thick.

Petrography: (C. Agee, UNM) This is an ultramafic rock with olivine (~40%), pigeonite + augite (~40%) and maskelynite (~10%). The olivines, pigeonites and clinopyroxenes show fairly tight compositional ranges. Accessory ilmenite, Ti-Cr-Fe spinel, and Fe-sulfide were observed throughout the sample. The maskelynite commonly displays altered rims.

Geochemistry: (C. Agee and M.Spilde, UNM) Olivine Fa36.0±1.6, Fe/Mn=51±3, n=21; pigeonite Fs27.0±2.2Wo10.0±3.0, Fe/Mn=29±1, n=16; augite Fs17.6±0.6Wo33.3±1.2, Fe/Mn=26±1, n=5; maskelynite An53.7±2.2Ab44.6±4.2Or1.6±0.3, n=7.

Classification: Martian (shergottite). This is a martian meteorite based on Fe/Mn of orthopyroxene, clinopyroxene and olivine, and the An-Ab-Or content of maskelynite. This is an ultramafic shergotitte based on the mineral proportions of olivine, pyroxene and plagioclase (maskelynite). Presence of maskelynite in this meteorite is typical for shergottites.

Specimens: 23.5 g including a probe mounts on deposit at UNM, DPitt holds the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase:Mauritania
Date:P April 2016
Mass (g):166.2
Class:Martian (shergottite)
Shock stage:high
Weathering grade:moderate
Fayalite (mol%):36.0±1.6
Ferrosilite (mol%):27.0±2.2, 17.6±0.6
Wollastonite (mol%):10.0±3.0, 33.3±1.2
Classifier:C. Agee, UNM
Type spec mass (g):23.5
Type spec location:UNM
Main mass:Darryl Pitt
Comments:Submitted by C.Agee
   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)
DPitt: Darryl Pitt, 225 West 83rd Street, New York, NY 10024, United States; Website (private address)
References: Published in Meteoritical Bulletin, no. 105, MAPS 52, 2411, September 2017. http://onlinelibrary.wiley.com/doi/10.1111/maps.12944/full
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     This is 1 of 8674 approved meteorites from (Northwest Africa) (plus 1882 unapproved names)

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