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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:  272 g | ||||||||||||||||||||||||||||
| Classification history: |
This is 1 of 494 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 Meteoritical Bulletin, no. 110, in preparation (2021)
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Geography:
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Statistics: This is 1 of 137 approved meteorites from Mauritania (plus 1 unapproved name) (plus 2 impact craters) | ||||||||||||||||||||||||||||