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Northwest Africa 8686
Basic information Name: Northwest Africa 8686
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 8686
Observed fall: No
Year found: 2014
Country: (Northwest Africa)
Mass:help 376 g
Meteoritical Bulletin:  MB 103  (2014)  Martian (shergottite)
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 324 approved meteorites (plus 2 unapproved names) classified as Martian (shergottite).   [show all]
Search for other: Martian meteorites
Comments: Approved 13 Dec 2014
Writeup from MB 103:

Northwest Africa 8686 (NWA 8686)

(Northwest Africa)

Purchased: 2014

Classification: Martian meteorite (Shergottite)

History: Purchased by Aziz Habibi in Morocco, 2014.

Physical characteristics: Single stone with weathered fusion crust, some light colored desert sediment coating, broken surface reveals-fine grained, light gray-green basaltic texture.

Petrography: (C. Agee, UNM) Microprobe examination of a polished epoxy mount shows ~10% olivine, ~60% pyroxene, ~25% maskelynite, ubiquitous Cr-Ti-Fe oxides and troilite. Pyroxenes and olivines show igneous zonation in BSE images, heavily shocked, grain size ranges from ~50-500 μm.

Geochemistry: (C. Agee and N. Muttik, UNM) EMPA. Olivine Fa49.9±4.9, Fe/Mn=55±1, n=24; pigeonite Fs31.8±4.6Wo10.1±2.2, Fe/Mn=31±2, n=36; augite Fs24.0±2.6Wo29.4±5.0, Fe/Mn=29±2, n=7; maskelynite Or3.1±0.5Ab48.5±3.0An48.3±3.4, n=12. Oxygen Isotopes, laser fluorination (K. Ziegler, UNM), analyses on 3 acid-washed aliquots, 0.9, 1.3, 1.5 mg, gave values δ17O=2.879, 2.723, 2.511, δ18O=4.984, 4.671, 4.417, Δ17O=0.247, 0.257, 0.179 (linearized, all permil).

Classification: Achondrite (Martian basalt), olivine-phyric shergottite, zoned olivines and pigeonites show significant iron-enrichment trend.

Specimens: 20.4 g including microprobe mount on deposit UNM, Aziz Habibi holds the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2014
Mass (g):376
Class:Martian (shergottite)
Shock stage:high
Weathering grade:low
Fayalite (mol%):49.9±4.9
Ferrosilite (mol%):31.8±4.6
Wollastonite (mol%):10.1±2.2
Classifier:C. Agee, UNM
Type spec mass (g):20.4
Type spec location:UNM
Main mass:Aziz Habibi
Comments:Submitted by C. Agee
Plots: O isotopes:  
   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)
References: Published in Meteoritical Bulletin, no. 103, MAPS 52, 1014, May 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12888/full
Find references in NASA ADS:
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     This is 1 of 9747 approved meteorites from (Northwest Africa) (plus 1866 unapproved names)

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