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Northwest Africa 11777 | |||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 11777 This is an OFFICIAL meteorite name. Abbreviation: NWA 11777 Observed fall: No Year found: 2017 Country: (Northwest Africa) Mass: 705 g | ||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 595 approved meteorites (plus 1 unapproved name) classified as Eucrite. [show all] Search for other: Achondrites, Eucrites, and HED achondrites | ||||||||||||||||||||||||||||||
Comments: | Approved 7 Jun 2018 | ||||||||||||||||||||||||||||||
Writeup |
Writeup from MB 107:
Northwest Africa 11777 (NWA 11777) (Northwest Africa) Purchased: 2017 Classification: HED achondrite (Eucrite) History: One mostly crusted stone weighing 705 g was found in Morocco prior to 2017. J. Donald Cline and John Sinclair acquired the sample from a meteorite dealer at the Tucson Gem and Mineral Show in February of 2017. Physical characteristics: Sample is rounded to irregularly shaped and contains many narrow and broad, shallow regmaglypts on 1/3 of its surface. Sample is ~85% covered by orange brown to dark brown patina, some of which may be original fusion crust. Fractures within the patina show a light-colored interior with fine-grained basaltic texture. Petrography: Description and classification (A. Love, App): Sample is a breccia composed of up to 1 cm, rounded to irregularly shaped, ophitic, cumulate textured clasts and subophitic basaltic textured clasts. Clasts are set within a matrix of granular eucritic debris. Pyroxenes are exsolved. Minerals: orthopyroxene, Ca-pyroxene, ilmenite, phosphates, SiO2 polymorph, FeS. Geochemistry: (A. Love, App) Eucrite: low-Ca pyroxene Fs61.2±0.5Wo2.5±0.4 (Fs60.2-62.1Wo2.0-3.2, FeO/MnO=29.4-31.1, N=14); high-Ca pyroxene exsolution lamellae Fs26.4±0.7Wo44.2±0.6 (Fs25.1-27.8Wo42.9-44.9, FeO/MnO=29.6-32.0, N=14); plagioclase (An88.0±2.0Or0.0 (An85.2-91.9Or0.0, N=14); Classification: HED (equilibrated basaltic eucrite) Original igneous textures within clasts are preserved while major element compositions of pyroxenes within sample are equilibrated. Plagioclase compositions are poorly equilibrated. Specimens: PARI holds the main mass. One 20 g endcut and a polished thin section are on deposit at App. | ||||||||||||||||||||||||||||||
Data from: MB107 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) PARI: Pisgah Astronomical Research Institute 1 Pari Dr Rosman, NC 28772, United States (institutional address; updated 13 Sep 2016) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462
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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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