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Northwest Africa 10593
Basic information Name: Northwest Africa 10593
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 10593
Observed fall: No
Year found: 2014
Country: Morocco
Mass:help 279 g
Meteoritical Bulletin:  MB 105  (2016)  Martian (shergottite)
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 327 approved meteorites (plus 2 unapproved names) classified as Martian (shergottite).   [show all]
Search for other: Martian meteorites
Comments: Approved 3 Apr 2016
Writeup from MB 105:

Northwest Africa 10593 (NWA 10593)


Purchased: 2014 Sept

Classification: Martian meteorite (Shergottite)

History: Purchased by D. DGregory at the Denver mineral show in September 2014 from a Moroccan dealer

Physical characteristics: (I. Nicklin, ROM) Two pieces with an aggregate weight of 279.0 g, the largest piece weighs 219.0 g. Notably regmaglypted surface with significant (~50%) remnant fusion crust, although some of what appears to be fusion crust is actually melt glass showing through from the interior of the specimen. A small amount of caliche is present on one surface. Where the fusion crust is absent, the interior contains small, randomly oriented, gray-green pyroxene grains surrounding transparent grains of plagioclase.

Petrography: Petrograph: (I. Nicklin, ROM) In thin section, the rock is composed of medium-grained prismatic pyroxenes up to 2.5 mm in length intermixed with more equant pyroxene grains in the 1 mm range. The prismatic pyroxenes show twinning. The pyroxenes generally surround stubby to lath-shaped grains of isotropic plagioclase-composition glass based on EMP analysis. In crossed polars, this glass shows crystallites of sub-radiating, gray-white anisotropic needles arranged in margins where the glass is in contact with pyroxene grains. Another notable feature is the presence of large areas (~25% of the cut surface area) of dark-colored, interconnecting melt-glass pockets with vesicles up to or exceeding 1 mm in greatest dimension. In addition to the melt-glass pockets, vesicles and plagioclase-composition glass there are pervasive planar fractures especially noticeable in the prismatic pyroxenes and mosaicism plainly apparent in all the pyroxene grains. No olivine has been observed.

Geochemistry: Mineral compositions and geochemistry: (V. Di Cecco, ROM) Pyroxenes: chaotically zoned augite cores (Fs27.6±7.8Wo30.6±1.8 (n=11); FeO/MnO = 30.8±3.6 (n=11)) ferropigeonite rims (Fs61.4±7.4Wo17.1±2.8 (n=7) ; FeO/MnO = 38.4±1.2 (n=7)) and pigeonite mantles (Fs39.2±8.0Wo13.6±1.9 (n=11); FeO/MnO = 32.2. The average composition of the plagioclase is An48.3±4.7Or2.85±1.7 (n=19). Oxygen isotopes (K. Ziegler, UNM): analyses of four acid-washed subsamples by laser fluorination gave, respectively, δ17O = 2.576, 2.736, 2.710, 2.582; δ18O 4.373, 4.714, 4.691, 4.484; Δ17O = 0.267, 0.247, 0.233, 0.214 (all values in per mil).

Classification: Martian (shergottite)

Specimens: 20.5 g plus one polished thin section are on hand at the ROM and constitute type material. The remainder is held by DGregory.

Data from:
  Table 0
  Line 0:
Place of purchase:Denver
Date:P 2014 Sept
Mass (g):279.0
Class:Martian (shergottite)
Shock stage:high
Weathering grade:low
Classifier:I. Nicklin, ROM; V. Di Cecco, ROM
Type spec mass (g):20.5
Type spec location:ROM
Main mass:DGregory
Comments:ROM tracking number, DGR025-15; submitted by I. Nicklin, ROM
Plots: O isotopes:  
   and collections
ROM: Royal Ontario Museum, 100 Queen's Park, Toronto, Ontario M5S 2C6, Canada (institutional address; updated 18 Oct 2011)
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
DGregory: David Gregory, 230 First Avenue, Suite 108, St. Thomas, Ontario N5R 4P5, Canada (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 2118 approved meteorites from Morocco (plus 32 unapproved names) (plus 1 impact crater)

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