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Northwest Africa 10922
Basic information Name: Northwest Africa 10922
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 10922
Observed fall: No
Year found: 2013
Country: (Northwest Africa)
Mass:help 182 g
Meteoritical Bulletin:  MB 105  (2016)  Martian (basaltic breccia)
MB 107  (2018)  Martian (polymict breccia)
Recommended:  Martian (polymict breccia)    [explanation]

This is 1 of 18 approved meteorites classified as Martian (polymict breccia).   [show all]
Search for other: Martian meteorites
Comments: Approved 3 Dec 2016
Revised 16 Nov 2018: Updated class; see NWA 7034)
Writeup from MB 105:

Northwest Africa 10922 (NWA 10922)

(Northwest Africa)

Purchased: 2013

Classification: Martian meteorite (basaltic breccia)

History: Purchased by Jay Piatek from Adam Aaronson in Morocco, 2013.

Physical characteristics: Single stone. The stone appears to have been sitting in the desert soil only half exposed for a relatively long time, as one side appeared smoothed and shiny, with a sand-blasted, black exterior, while the other side was covered with light-yellow caliche. Upon removal of the caliche with diluted glacial acetic acid, a preserved, brown colored, glassy, flow-lined, fusion crust was revealed. Saw cut shows a breccia with numerous dark and light colored fragmental crystals and polycrystalline lithologies, scattered spherules and spherical objects. An unusual trapezium-shaped object (~ 5mm) was observed, containing dark red concentric layers or zones, with a spherule at its center. Groundmass is dark gray, fine-grained, with scattered opaques throughout.

Petrography: (C. Agee, UNM) Microprobe examination of the polished deposit sample shows a polymict breccia with fragmental feldspar and pyroxene crystals up to 5 mm, iron-oxide-rich spherules, silicate-rich spherules, all set in a very fine-grained groundmass composed of feldspar, pyroxene, oxides, phosphates, zircon, baddeleyite, and sulfides. The trapezium-shaped object described above consisted of distinct zones or layers of very fine-grained mixture of feldspars, pyroxenes and opaques. The sphere at the center of the trapezium shaped object contained euhedral olivine grains set in a quench-melt groundmass.

Geochemistry: (C. Agee, M. Spilde, M. Habermann UNM) plagioclase Ab54.8±5.7An43.1±6.3Or2.1±0.6, n=9; albitic feldspar Ab84.0An2.7Or13.3, n=1; potassium feldspar Ab24.5±2.6An3.7±1.5Or71.7±4.1, n=2; low-Ca pyroxene Fs31.2±7.7Wo3.7±2.1, Fe/Mn=35±3, n=17; augite Fs24.1±8.3Wo38.6±7.5, Fe/Mn=32±5, n=2; olivine Fa34.3±0.5, Fe/Mn=38±2, NiO=0.53±0.05 (wt%), n=5. Oxygen isotopes (K. Ziegler, UNM) acid-washed material analyzed in 4 replicates by laser fluorination gave, respectively δ18O= 6.192, 5.992, 5.746, 5.960; δ17O= 3.826, 3.750, 3.588, 3.714; Δ17O= 0.557, 0.586, 0.554, 0.567 (linearized, all per mil).

Classification: Martian (basaltic breccia). Paired with NWA 7034. This specimen is the only known NWA 7034 pairing with documented glassy fusion crust.

Specimens: 22 g on deposit at UNM, Jay Piatek holds the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2013
Mass (g):182
Class:Martian (basaltic breccia)
Shock stage:low
Weathering grade:low
Fayalite (mol%):34.3±0.5
Ferrosilite (mol%):31.2±7.7, 24.1±8.3
Wollastonite (mol%):3.7±2.1, 38.6±7.5
Classifier:C. Agee, UNM
Type spec mass (g):22
Type spec location:UNM
Main mass:Jay Piatek
Comments:Field name BB-182; 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)
Aaronson: Sahara Overland Ltd., Harhora, Temara, 12000, Morocco (private address; updated 3 Jan 2010)
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 9772 approved meteorites from (Northwest Africa) (plus 1862 unapproved names)

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