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Northwest Africa 11509
Basic information Name: Northwest Africa 11509
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11509
Observed fall: No
Year found: 2017
Country: (Northwest Africa)
Mass:help 500 g
Meteoritical Bulletin:  MB 106  (2018)  Martian (shergottite)
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 284 approved meteorites (plus 2 unapproved names) classified as Martian (shergottite).   [show all]
Search for other: Martian meteorites
Comments: Approved 6 Dec 2017
Writeup from MB 106:

Northwest Africa 11509 (NWA 11509)

(Northwest Africa)

Purchased: 2017 Sep

Classification: Martian meteorite (Shergottite)

History: Found in Mali and purchased in Agadir, Morocco by Aziz Habibi in September 2017. Subsequently the stone was acquired by Ben Hoefnagels.

Petrography: (A. Irving and S. M. Kuehner, UWS; P. Carpenter, WUSL) Relatively coarse grained specimen consisting of relatively equant grains of clinopyroxene and olivine (grainsize 1.4- 3 mm) with vesicular, plagioclase-rich interstitial regions. The mineral mode determined from a large back-scattered electron mosaic is 50.5 vol.% clinopyroxene, 20.1 vol.% plagioclase, 17.1 vol.% olivine, 11.1 vol.% vesicles, 1.0 vol.% oxides (chromite + ilmenite) and 0.2 vol.% pyrrhotite. Clinopyroxene and olivine exhibit limited compositional zoning; olivine has been recrystallized into aggregates of ultra fine grained polygonal subgrains. Plagioclase has a curved lath-like habit; it is not maskelynite, but is birefringent and polycrystalline. Both Ti-rich and Ti-poor chromite are present and some pyrrhotite contains minor Ni. No phosphates were observed despite a careful search.

Geochemistry: Olivine (Fa37.9-57.0, FeO/MnO = 50-55, N = 5), pigeonite (Fs26.3-35.7Wo6.4-16.1; Fs36.1Wo21.7; FeO/MnO = 26-34, N = 5), subcalcic augite (Fs19.8-27.2Wo33.3-32.9, FeO/MnO = 25-32, N = 2), plagioclase (An56.0-56.8Or1.8-0.7, N = 2).

Classification: Martian meteorite (shergottite, olivine gabbroic).

Specimens: 20.1 g including one polished thin section at UWB; remainder with Ben Hoefnagels.

Data from:
  Table 0
  Line 0:
Place of purchase:Agadir
Date:P 2017 Sep
Mass (g):500
Class:Martian (shergottite)
Shock stage:high
Weathering grade:low
Fayalite (mol%):37.9-57.0
Ferrosilite (mol%):26.3-35.7; 36.1; 19.8-27.2
Wollastonite (mol%):6.4-16.1; 21.7; 33.3-32.9
Classifier:A. Irving, S. Kuehner and P. Carpenter, UWS
Type spec mass (g):20.1
Type spec location:UWB
Main mass:B. Hoefnagels
Comments:Work name AH 38; submitted by A. Irving
   and collections
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
WUSL: Washington Univ., One Brookings Drive, St. Louis, MO 63130, United States (institutional address; updated 17 Oct 2011)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
References: Published in Gattacceca J., Bouvier A., Grossman J., Metzler K., and Uehara M. (2019) Meteoritical Bulletin, no. 106. Meteorit. Planet. Sci. 54 in press.
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     This is 1 of 8636 approved meteorites from (Northwest Africa) (plus 1884 unapproved names)

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