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Northwest Africa 12002
Basic information Name: Northwest Africa 12002
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12002
Observed fall: No
Year found: 2017
Country: Morocco
Mass:help 5 g
Meteoritical Bulletin:  MB 107  (2018)  Martian (shergottite)
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 322 approved meteorites (plus 2 unapproved names) classified as Martian (shergottite).   [show all]
Search for other: Martian meteorites
Comments: Approved 16 Oct 2018
Writeup from MB 107:

Northwest Africa 12002 (NWA 12002)


Purchased: 2017

Classification: Martian meteorite (Shergottite)

History: Purchased from a France-based Moroccan dealer in 2017, via internet.

Physical characteristics: The main mass is a single, green-gray chip with adhering red-brown dust and fusion crust on one side.

Petrography: (C. Herd and L. Tunney, UAb; E. Walton and H. Jurak, MacEwan U) Optical and microprobe examination of a polished thin section shows low-Ca pyroxene oikocrysts up to 3.5 mm in longest dimension enclosing equant, rounded olivine and subhedral rounded to euhedral chromite chadacrysts. Assemblages of plagioclase, low- and high-Ca pyroxene, Ti-bearing chromite comprise the non-poikilitic areas. Shock deformation and transformation effects in host rock minerals include strong mosaicism of olivine and pyroxene, mechanical twinning in pyroxene and complete transformation of plagioclase to maskelynite. Small, isolated pockets of shock melt are heterogeneously distributed throughout the host rock, from which needles of stishovite have crystallized. Thin black veinlets of quenched shock melt cut across and displace igneous minerals.

Geochemistry: (C. Herd and L. Tunney, UAb) Data obtained by EMP examination of carbon-coated thin section: Olivine Fa39.7±1.5 (range Fa34.1-41.2), FeO/MnO = 51 (n=35); low-Ca pyroxene Fs29.4±2.4Wo10.6±3.3 (range Fs24.6-32.8Wo2.8-16.6), FeO/MnO = 30 (n=23); high-Ca pyroxene Fs18.4±1.2Wo33.8±2.2 (range Fs16.5-20.7Wo31.2-38), FeO/MnO = 25 (n=9); plagioclase An50.9±4.8Or2.8±1.3 (range An40.6-56.9Or1.4-6.2) (n=20). Chromite range TiO2 = 0.9-17 wt% (n=16).

Classification: Martian (shergottite, poikilitic)

Specimens: Type specimen of 3.2 g, including one thin section, at UAb. 1 g with M. Ouzillou.

Data from:
  Table 0
  Line 0:
Place of purchase:France
Date:P 2017
Mass (g):5.0
Class:Martian (shergottite)
Shock stage:moderate
Weathering grade:low
Classifier:C. Herd and L. Tunney, UAb
Type spec mass (g):3.2
Type spec location:UAb
Main mass:M. Ouzillou
Comments:Field number MMO-2018-3C; submitted by C. Herd
   and collections
UAb: 1-26 Earth Sciences Building, University of Alberta, Edmonton, AB, T6G 2E3, Canada, Canada; Website (institutional address; updated 17 Oct 2011)
References: Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462
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     This is 1 of 2089 approved meteorites from Morocco (plus 31 unapproved names) (plus 1 impact crater)

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