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Northwest Africa 5029
Basic information Name: Northwest Africa 5029
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 5029
Observed fall: No
Year found: 2003
Country: Morocco
Mass:help 14.7 g
Meteoritical Bulletin:  MB 93  (2008)  Martian (shergottite)
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 183 approved meteorites (plus 1 unapproved name) classified as Martian (shergottite).   [show all]
Search for other: Martian meteorites
Comments: Approved 14 Jan 2008
Revised 4 Aug 2008: final writeup
Writeup from MB 93:

Northwest Africa 5029


Find: March 2003

Achondrite (Martian, basaltic shergottite)

History: In March 2003, B. Fectay and C. Bidaut purchased the stone in M’hamid, Morocco.

Physical characteristics: Individual stone with 60% fusion crust, broken on one face with a total mass of 14.67 g.

Petrography: (T. Mikouchi, UTok) The meteorite is mainly composed of 78% pyroxenes and 18% plagioclase (maskelynite). The pyroxenes show an elongated euhedral to subhedral texture reaching 5 mm × ~0.5 mm. Plagioclase is completely transformed to maskelynite, showing an interstitial lath texture (1 × 0.3 mm) to pyroxenes. Minor phases include Ca phosphate, silica, ilmenite, chromite, and Fe sulfide. They are typically present in the mesostasis areas. Shock metamorphism is extensive as suggested by the presence of maskelynite and undulatory extinction of pyroxenes.

Mineral compositions and Geochemistry: The pyroxenes are extensively zoned from the Mg-rich low-Ca pyroxene cores (Mg78Fe19Ca3) to Fe-rich, low-Ca pyroxene rims (Mg13Fe72Ca14) via augite mantles (Mg45Fe22Ca33). The FeO/ MnO wt% ratio of pyroxenes (30-40) is within the range of Martian meteorites. Maskelynite is weakly zoned (An55Ab43Or2 to An45Ab51Or4).

Classification: Achondrite (Martian basalitic shergottite). The mineral compositions are close to those of NWA 480/ 1460, but the texture of this new meteorite is slightly different (e.g., lower abundance of maskelynite).

Type specimens: A total sample mass of 2 g and one thin section are on deposit at UTok (T. Mikouchi). A mass of 1 g is also at IUEM (J. A. Barrat). Fectay holds the main mass.

Submitted by: T. Mikouchi, UTok.

Data from:
  Table 2
  Line 190:
Place of purchase:M’hamid, Morocco
Date:March 2003
Mass (g):14.67
Type spec mass (g):2
   and collections
IUEM: Institut Universitaire Européen de la Mer, Université de Bretagne Occidentale, place Nicolas Copernic, F-29280 Plouzané Cedex, France (institutional address; updated 15 Sep 2017)
UTok: Department of Earth and Planetary Science, Graduate School of Science, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan (institutional address; updated 5 Nov 2011)
Fectay: Bruno Fectay and Carine Bidaut, La Memoire de la Terre SARL, 39800 Aumont, France; Website (private address)
References: Published in Meteoritical Bulletin, no. 93, MAPS 43, 571-632 (2008)
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     This is 1 of 1335 approved meteorites from Morocco (plus 15 unapproved names) (plus 1 impact crater)

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