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Northwest Africa 12694 | |||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 12694 This is an OFFICIAL meteorite name. Abbreviation: NWA 12694 Observed fall: No Year found: 2018 Country: Algeria Mass: 253 g | ||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 459 approved meteorites classified as Howardite. [show all] Search for other: Achondrites, HED achondrites, and Howardites | ||||||||||||||||||||||||||||||
Comments: | Approved 4 Jul 2019 | ||||||||||||||||||||||||||||||
Writeup |
Writeup from MB 108:
Northwest Africa 12694 (NWA 12694) Algeria Purchased: 2018 Classification: HED achondrite (Howardite) History: Reportedly found in 2018 by nomads in Algeria. Purchased in Ensisheim from a Moroccan meteorite dealer, 2018. Physical characteristics: Single stone covered with fusion crust, some of which is slightly weathered, while some patches show shiny black glass with contraction cracks and flight-smooth edges; possibly oriented. The cut surface reveals a fragmental breccia of light and dark clasts set in a light-gray groundmass. Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows a polymict breccia of basaltic eucrite grains (~60%) and diogenite grains (~40%). Most eucritic pyroxenes display exsolution lamellae and are typically finer-grained than the diogenitic pyroxene grains. Accessory olivine, chromite, silica, and troilite was observed. Geochemistry: (C. Agee, UNM) Olivine Fa50.7±4.3, Fe/Mn=45±2, n=2; eucritic pyroxene Fs49.1±11.3Wo13.7±12.7, Fe/Mn=31±2 n=12; diogenitic pyroxene Fs24.6±3.2Wo2.4±0.8, Fe/Mn=28±2 n=8; plagioclase An90.6±5.5, n=8. Classification: Howardite Specimens: 20 g on deposit at CSFK, probe mount at UNM, ZKereszty holds the main mass. | ||||||||||||||||||||||||||||||
Data from: MB108 Table 0 Line 0: |
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Institutions and collections |
UNM: Institute of Meteoritics
MSC03 2050
University of New Mexico
Albuquerque NM 87131-1126
USA, United States; Website (institutional address; updated 12 Feb 2015) ZKereszty: Gyor, Lahner 1. 9024 , Hungary (private address; updated 8 Sep 2014) CSFK: Research Center for Astronomy and Earth Sciences, H-1121 Budapest, Konkoly Thege Miklós út 15-17.l Hungary, Hungary (institutional address; updated 7 Apr 2015) |
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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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Photos: |
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Geography: |
Statistics: This is 1 of 1336 approved meteorites from Algeria (plus 30 unapproved names) (plus 4 impact craters) | ||||||||||||||||||||||||||||||
Also see: |
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Revision history: |
This lists important revisions made to data for this record.
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