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Northwest Africa 15257 | |||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 15257 This is an OFFICIAL meteorite name. Abbreviation: NWA 15257 Observed fall: No Year found: 2022 Country: (Northwest Africa) Mass: 920 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 14 Sep 2022 | ||||||||||||||||||||||||||||
Writeup |
Writeup from MB 111:
Northwest Africa 15257 (NWA 15257) (Northwest Africa) Purchased: 2022 Classification: HED achondrite (Eucrite) History: Many fragments were found (main masses: 496, 160, 154, and 60 g) in northwest Africa. Adrián Contreras Gómez (CRATER meteorites) purchased the samples from Ali Hnini in 2022. Physical characteristics: Samples are brecciated and light gray, and some show a thin black fusion crust. Petrography: Description and classification (A. Love, App) Sample is a polymict breccia composed of 2mm equilibrated lithic fragments and related mineral debris. Lithic fragments have subophitic, cumulate, granulitic textures and shock melted textures. Pyroxenes are exsolved. Additional minerals are: chromite, ilmenite, a Si polymorph, fayalitic olivine, troilite, merrillite and rare Fe metal grains. Geochemistry: (A. Love, App) Olivine (Fa78.7±5.8, Fe/Mn=38.1±2.2, n=3); low Ca pyroxene (Fs54.0±11.3Wo2.1±0.8, Fe/Mn=30.5±1.5, n=20); pigeonite (Fs46.0Wo18.3, Fe/Mn=31.8, n=1); high Ca pyroxene (Fs26.2±5.2Wo41.3±2.5, Fe/Mn=30.1±2.8, n=9); plagioclase (An91.3±4.4Or0.3±0.3, n=8). Classification: HED achondrite (polymict eucrite breccia M-S3 low weathering). Based on textural diversity of lithic clasts and unequilibrated compositions, this is a polymict eucrite breccia. Specimens: Adrián Contreras Gómez (CRATER meteorites) holds the main masses. Many small fragments weighing 22.34g and a polished thin section and mount are on deposit at App. | ||||||||||||||||||||||||||||
Data from: MB111 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) |
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Catalogs: |
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References: | Published in Gattacceca J., McCubbin F. M., Grossman J. N., Schrader D. L., Chabot N. L., D’Orazio M., Goodrich C., Greshake A., Gross J., Joy K. H., Komatsu M. and Miao B. (2023) The Meteoritical Bulletin, No. 111. Meteoritics & Planetary Science 58, 901–904. ?
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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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