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| Northwest Africa 10640 | |||||||||||||||||||||||||||||||
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| Basic information | Name: Northwest Africa 10640 This is an OFFICIAL meteorite name. Abbreviation: NWA 10640 Observed fall: No Year found: 2015 Country: Morocco Mass:  41.9 g | ||||||||||||||||||||||||||||||
| Classification history: |
This is 1 of 281 approved meteorites classified as Eucrite-mmict. [show all] Search for other: Achondrites, Eucrites, and HED achondrites | ||||||||||||||||||||||||||||||
| Comments: | Approved 1 Jun 2016 | ||||||||||||||||||||||||||||||
| Writeup |
Writeup from MB 105:
Northwest Africa 10640 (NWA 10640) Morocco Purchased: 2015 Sept Classification: HED achondrite (Eucrite, monomict) History: A single stone of 41.9 g was found by an anonymous finder in Western Sahara and purchased 2015 in Erfoud by Hichame Mimaghador Physical characteristics: The main mass is covered by a black fusion crust. A sawn surface reveals a brecciated texture. Petrography: (V. Moggi Cecchi, G. Pratesi, S. Caporali, UniFi): A thin section shows a monomict breccia composed of basaltic eucrite clasts in a matrix of related debris. Eucritic clasts are characterized by clinopyroxene, minor anorthitic plagioclase and orthopyroxene with fine (2-3 μm) pigeonite exsolution lamellae. Minor phases are ilmenite, troilite and chromite. Geochemistry: (V. Moggi Cecchi, G. Pratesi, S. Caporali, UniFi); Eucritic clasts: Calcic plagioclase An 88.0±1.2Or0.9±0.1, n=7; low-Ca pyroxene (Fs56.1±1.3En43.6±1.3Wo2.3±0.2; n=7; Fe/Mn=36.5±0.3); augite (Fs39.2±8.5En28.0±2.1Wo32.9±6.5; n=7; Fe/Mn=35.4±0.1); pigeonite exsolution lamellae in orthopyroxene (Fs59.4±1.4En29.9±1.5Wo10.7±1.5; n=8; Fe/Mn = 34.2±0.3). matrix: low-Ca pyroxene (Fs64.1±1.3En32.4±1.4Wo3.5±0.4; n=8; Fe/Mn=34.0±0.3); Oxygen isotopes: (I. Franchi, R. Greenwood, OU) δ17O = 1.82‰, δ18O = 3.89‰, Δ17O = -0.21‰. Classification: Eucrite, monomict with moderate degree of shock and medium degree of weathering. Specimens: A total of 8.5 g specimen and one thin section is on deposit at the MSN-FI. Mimaghador owns the main mass. | ||||||||||||||||||||||||||||||
| Data from: MB105 Table 0 Line 0: |
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| Plots: | O isotopes: | ||||||||||||||||||||||||||||||
| Institutions and collections |
OU: Planetary and Space Sciences
Department of Physical Sciences
The Open University
Walton Hall
Milton Keynes
MK7 6AA
United Kingdom, United Kingdom (institutional address; updated 8 Dec 2011) MSN-FI: Museo di Storia Naturale “La Specola”, Sez. Mineralogia – Sistema Museale dell'Università degli Studi di Firenze Via Giorgio La Pira, 4 – 50121 Firenze, Italy; Website (institutional address; updated 24 Oct 2022) UniFi: Università degli Studi di Firenze, P.zza S. Marco, 4 - 50121 Firenze, Italy (institutional address; updated 14 Sep 2013) |
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| Catalogs: |
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| References: | Published in Meteoritical Bulletin, no. 105, MAPS 52, 2411, September 2017. http://onlinelibrary.wiley.com/doi/10.1111/maps.12944/full
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| Photos: |
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Geography:
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Statistics: This is 1 of 2082 approved meteorites from Morocco (plus 31 unapproved names) (plus 1 impact crater) | ||||||||||||||||||||||||||||||
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| Revision history: |
This lists important revisions made to data for this record.
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