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Northwest Africa 12978 | |||||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 12978 This is an OFFICIAL meteorite name. Abbreviation: NWA 12978 Observed fall: No Year found: 2018 Country: (Northwest Africa) Mass: 1022 g | ||||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 104 approved meteorites classified as Eucrite-melt breccia. [show all] Search for other: Achondrites, Eucrites, and HED achondrites | ||||||||||||||||||||||||||||||||
Comments: | Approved 23 Dec 2019 | ||||||||||||||||||||||||||||||||
Writeup |
Writeup from MB 108:
Northwest Africa 12978 (NWA 12978) Northwest Africa Purchased: 2018 Classification: Eucrite melt breccia History: Thierry Simard purchased the 1022 g sample in Rissani, Morocco, in 2018 November. Physical characteristics: Sample is rounded-irregular in shape, coated with a dark-brown weathered patina containing numerous pits that show the surface expression of lithic fragments. The cut face shows a brecciated structure composed of light-colored igneous-textured clasts set in a finer-grained dark matrix. Petrography: Description and classification: (A. Love, App): Sample is a melt rock-supported breccia composed of 1.2 mm - 2.5 cm rounded-irregular-shaped brecciated, rare cumulate and basaltic-textured clasts and related mineral debris set in within a quenched melt matrix. Basaltic clasts have subophitic textures and contain exsolved pyroxenes. Additional minerals are: fayalite, a silica polymorph, ilmenite, rare zircon and phosphate. Geochemistry: (A. Love, App): Low Ca pyroxene (Fs61.9±2.0Wo2.9±1.7, Fe/Mn=31.2±1.3, Mg#36.2±2.0, n=14); high Ca pyroxene (Fs28.5±2.4Wo42.6±0.8, Fe/Mn=30.9±0.9, n=8); plagioclase (An89.2±6.2Or0.5±0.6, n=10). Classification: HED Achondrite (eucrite melt breccia). Textures and mineral compositions (Fe/Mn ratios and Mg# of pyroxenes) indicate this sample is a basaltic eucrite melt breccia. Specimens: Thierry Simard holds the main mass. Several fragments and a polished thin section comprise 22 g type specimen which is on deposit at App. | ||||||||||||||||||||||||||||||||
Data from: MB108 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 Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
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Geography: |
Statistics: This is 1 of 9699 approved meteorites from (Northwest Africa) (plus 1854 unapproved names) | ||||||||||||||||||||||||||||||||
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Revision history: |
This lists important revisions made to data for this record.
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