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Northwest Africa 11516 | |||||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 11516 This is an OFFICIAL meteorite name. Abbreviation: NWA 11516 Observed fall: No Year found: 2016 Country: (Northwest Africa) Mass: 1235 g | ||||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 406 approved meteorites classified as Eucrite-pmict. [show all] Search for other: Achondrites, Eucrites, and HED achondrites | ||||||||||||||||||||||||||||||||
Comments: | Approved 6 Dec 2017 | ||||||||||||||||||||||||||||||||
Writeup |
Writeup from MB 106:
Northwest Africa 11516 (NWA 11516) (Northwest Africa) Purchased: 2016 Classification: HED achondrite (Eucrite, polymict) History: Eight uncrusted stones weighing a total of 1234.65 g were found in Morocco prior to 2016. Blaine Reed acquired the samples from a meteorite dealer at the Denver Gem and Mineral Show in September of 2016. Physical characteristics: Specimen is dark brownish-black-colored, irregularly shaped, pitted, lacks fusion and is weakly magnetic. Samples have a discontinuous coating of light orange caliche. Interior shows a brecciated texture and some flecks of Fe-metal are visible on the surface. Petrography: Description and Classification (A. Love, App): Sample is a breccia composed of angular to subrounded clasts (up to 2 cm) of: vitrophyric basalt; ophitic basalt; cumulate (equilibrated cumulate); diogenite (<10 vol%), secondary breccias, rare glassy fragments and a shock melt clast. Many pyroxenes are exsolved, while one basaltic clast contains zoned pyroxenes. Eucrite clasts are dominant. Accessory minerals are: ilmenite, Si-polymorph, FeNi and Ni-free metal, chromite, FeS, fayalite, olivine, barite. Geochemistry: (A. Love, App) Low-Ca pyroxene (Fs59.3-60.7 Wo2.0-5.4, FeO/MnO=28.7-29.3, N=2); pigeonite (Fs37.5-56.1 Wo6.6-19.3, FeO/MnO=26.0-29.5, N=6); high-Ca pyroxene (Fs29.1-34.6 Wo35.0-38.4, N=6); plagioclase (An86.2-95.4 Or0.0-0.5, N=11); diogenitic orthopyroxene (Fs23.6-35.9 Wo2.3-3.5, FeO/MnO=26.5-32.8, N=8); olivine (Fa 42.8-79.2, FeO/MnO=40.3-50.2, N=2). Classification: HED (polymict eucrite breccia). Textures and mineral compositions suggest this is a polymict eucrite. Specimens: Blaine Reed holds the main mass. A slice and an endcut weighing 38.62g and a polished mount and thin section are on deposit at App. | ||||||||||||||||||||||||||||||||
Data from: MB106 Table 0 Line 0: |
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Institutions and collections |
App: Department of Geology, 572 Rivers St., Appalachian State University, Boone, NC 28608, United States (institutional address; updated 7 Mar 2013) Reed: Blaine Reed, P.O. Box 1141, Delta, CO 81416, United States; Website (private address) |
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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) | ||||||||||||||||||||||||||||||||
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Revision history: |
This lists important revisions made to data for this record.
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