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Northwest Africa 13742 | |||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 13742 This is an OFFICIAL meteorite name. Abbreviation: NWA 13742 Observed fall: No Year found: 2020 Country: Mauritania Mass: ![]() | ||||||||||||||||||||||||||||
Classification history: |
This is 1 of 569 approved meteorites (plus 1 unapproved name) classified as eucrite. [show all] Search for other: Achondrites, Eucrites, and HED achondrites | ||||||||||||||||||||||||||||
Comments: | Approved 21 Feb 2021 | ||||||||||||||||||||||||||||
Writeup![]() |
Writeup from MB 110:
Northwest Africa 13742 (NWA 13742) Mauritania Purchased: 2020 Classification: HED achondrite (Eucrite) History: Thirty-four samples with a TKW of 271.6 g were found in December 2020 by anonymous prospectors in Mauritania. John Higgins purchased the samples from a Mauritanian meteorite dealer in 2020. Physical characteristics: Samples are irregularly shaped and have a dark exterior lacking fusion crust. Some samples contain small holes that may represent vesicles. The cut face shows the interior is composed of abundant light-colored crystalline clasts set in a dark matrix. Petrography: Description and classification (A. Love, App) Sample is a breccia composed of mm-sized angular, basaltic-textured clasts set within a comminuted matrix of related debris. Pyroxenes are exsolved and both pyroxene and plagioclase show clouding by opaques and other phases. Additional minerals are: ilmenite, chromite, a silica polymorph, phosphates and terrestrial barite. Geochemistry: low Ca pyroxene (Fs64.1±1.0Wo2.6±0.7, Fe/Mn=30.5±1.1, Mg#=34.2±0.6, n=12); high Ca pyroxene (Fs29.1±1.7Wo42.6±2.0, Fe/Mn=31.9±1.0, n=12); plagioclase (An91.9±0.7Or0.4±0.1, n=9). Classification: HED achondrite (eucrite). Mineral compositions and textures suggest sample is an equilibrated basaltic eucrite breccia (M-S3, low weathering). Specimens: John Higgins holds the main masses. 7 slices, endpieces and fragments weighing 27.98 g, a polished mount and thin section are on deposit at App. | ||||||||||||||||||||||||||||
Data from: MB110 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., Bouvier A., Chabot N.L., D'Orazio M., Goodrich C., Greshake A., Gross J., Komatsu M., Miao B., and Schrader D. (2022) The Meteoritical Bulletin, No. 110. Meteorit. Planet. Sci. 1-4
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Geography:![]() |
Statistics: This is 1 of 187 approved meteorites from Mauritania (plus 2 unapproved names) (plus 2 impact craters) |