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Northwest Africa 12593
Basic information Name: Northwest Africa 12593
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12593
Observed fall: No
Year found: 2017
Country: Mali
Mass:help 333 g
Meteoritical Bulletin:  MB 108  (2020)  Lunar (frag. breccia)
Recommended:  Lunar (frag. breccia)    [explanation]

This is 1 of 35 approved meteorites classified as Lunar (frag. breccia).   [show all]
Search for other: Lunar meteorites
Comments: Approved 15 May 2019
Writeup from MB 108:

Northwest Africa 12593 (NWA 12593)


Purchased: 2017

Classification: Lunar (frag. breccia)

History: A single weathered stone lacking fusion crust found in Mali by nomads. Purchased by Dustin Dickens in Nouakchott, Mauritania, in 2017 from an anonymous meteorite dealer.

Physical characteristics: Dark, sand-blasted exterior, with many irregular shaped fragments set in a fine-grained dark groundmass. No fusion crust.

Petrography: (T. S. Hayden, M. Anand, OU) The meteorite is clast-rich fragmental breccia containing numerous mineral fragments and lithic clasts embedded in a fine-grained, vesiculated (regolith) matrix. The lithic clast population consists of basaltic clasts, granulite clasts and crystalline impact-melt breccias of olivine norite compositions. Size range of the clasts is 0.56-2.56 mm, and the main minerals are pyroxene, feldspar, olivine, silica, chromite, ilmenite, zircon and Ca phosphates (merrillite and apatite).

Geochemistry: Mineral composition and Geochemistry: (T. S. Hayden, M. Anand, OU) Feldspar (An93.8±2.7, Ab5.9±2.5, n=39), pigeonite (Fs30.5±9.1Wo13.1±3.4, FeO/MnO = 59.3±6.6, n=59), augite (Fs23.1±6.1Wo30.9±4.3, FeO/MnO = 54.2±4.4, n=18), olivine (Fa38.2±11.7, FeO/MnO = 103.2±7.1, n= 40). O isotopes (measured at OU): Repetition 1: δ17O = 3.328‰, δ18O = 6.361‰, Δ17O=-0.005‰ (linearized using a slope of 0.5247 (of Miller, M. F. (2002) GCA 66(11)), Repetition 2: δ17O = 3.203‰, δ18O = 6.106‰, Δ17O=-0.004‰ (linearized using a slope of 0.5247. Mean: δ17O = 3.266 ± 0.088‰ (1-sigma), δ18O = 6.234 ± 0.180‰ (1-sigma), Δ17O=0.000±0.006‰ (1sigma).

Classification: Lunar fragmental regolith breccia

Specimens: Specimen: 24 g type specimen held at OU. Dustin Dickens holds the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase:Nouakchott, Mauritania
Date:P 2017
Mass (g):332.8
Class:Lunar (frag. breccia)
Shock stage:Strongly
Weathering grade:Moderate
Fayalite (mol%):38.2±11.7 (N=40)
Ferrosilite (mol%):28.9±9.0 (N= 77)
Wollastonite (mol%):17.3±8.4 (N=77)
Classifier:T. S. Hayden, M. Anand, and R. C. Greenwood, OU
Type spec mass (g):24
Type spec location:OU
Main mass:Dustin Dickens
Finder:Nomads, Mali
Comments:Field name prior to submission: TMOU-05; submitted by T. S. Hayden (OU)
Plots: O isotopes:  
   and collections
OU: Planetary and Space Sciences Department of Physical Sciences The Open University Walton Hall Milton Keynes MK7 6AA United Kingdom, United Kingdom (institutional address; updated 8 Dec 2011)
References: Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
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     This is 1 of 122 approved meteorites from Mali (plus 2 unapproved names)

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