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Northwest Africa 11261 | |||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 11261 This is an OFFICIAL meteorite name. Abbreviation: NWA 11261 Observed fall: No Year found: 2017 Country: (Northwest Africa) Mass: 114.2 g | ||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 319 approved meteorites (plus 2 unapproved names) classified as Martian (shergottite). [show all] Search for other: Martian meteorites | ||||||||||||||||||||||||||||||
Comments: | Approved 9 Jun 2017 | ||||||||||||||||||||||||||||||
Writeup |
Writeup from MB 106:
Northwest Africa 11261 (NWA 11261) (Northwest Africa) Purchased: 2017 Mar Classification: Martian meteorite (Shergottite) History: Purchased by Ben Hoefnagels in March 2017 from a Moroccan dealer. Physical characteristics: A single rounded ellipsoidal stone (114.2 g) coated with red-brown weathering products, but with a fresher, green interior. Petrography: (A. Irving and S. Kuehner, UWS) Olivine-rich with predominantly an olivine-orthocumulate texture, although there are also sparse pigeonite oikocrysts (up to 3 mm) containing olivine chadacrysts. Other minerals are intercumulus pigeonite (~15 vol.%) and maskelynite (~6 vol.%), plus accessory chromite (with a range of Ti contents), ilmenite, pentlandite, pyrrhotite, Mg-bearing merrillite, rare baddeleyite and minor barite. The mafic silicate phases have very limited compositional variation. Polycrystalline melt inclusions surrounded by radial expansion cracks are present in olivine. Secondary calcite is present in the form of very thin cross-cutting veinlets and grain boundary coatings on maskelynite grains. Geochemistry: Olivine (Fa36.0-37.3, FeO/MnO = 48-50, N = 3), pigeonite (Fs29.3-30.3Wo8.6-6.8, FeO/MnO = 27-32, N = 3), maskelynite (An51.2-51.8Or1.4-1.7, N = 2). Classification: Martian (shergottite, olivine-orthocumulate). Specimens: 25 g including one polished thin section at UWB; remainder with Mr. B. 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) 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 9627 approved meteorites from (Northwest Africa) (plus 1865 unapproved names) | ||||||||||||||||||||||||||||||
Also see: |
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Revision history: |
This lists important revisions made to data for this record.
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