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Northwest Africa 11509 | |||||||||||||||||||||||||||||||
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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: 500 g | ||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 318 approved meteorites (plus 2 unapproved names) classified as Martian (shergottite). [show all] Search for other: Martian meteorites | ||||||||||||||||||||||||||||||
Comments: | Approved 6 Dec 2017 | ||||||||||||||||||||||||||||||
Writeup |
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: MB106 Table 0 Line 0: |
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Institutions 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, Burke Museum of Natural History and Culture, Box 353010 Seattle, WA 98195, United States (institutional address; updated 9 Oct 2023) |
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Catalogs: |
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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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Geography: |
Statistics: This is 1 of 9589 approved meteorites from (Northwest Africa) (plus 1869 unapproved names) | ||||||||||||||||||||||||||||||
Also see: |
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Revision history: |
This lists important revisions made to data for this record.
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