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| Northwest Africa 10639 | |||||||||||||||||||||||||||||||
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| Basic information | Name: Northwest Africa 10639 This is an OFFICIAL meteorite name. Abbreviation: NWA 10639 Observed fall: No Year found: 2015 Country: Western Sahara Mass:  232 g | ||||||||||||||||||||||||||||||
| Classification history: |
This is 1 of 280 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 10639 (NWA 10639) Western Sahara Purchased: 2015 Sept Classification: HED achondrite (Eucrite, monomict) History: A single stone of 232 g was found by an anonymous finder in Western Sahara and purchased 2015 in Erfoud by Hichame Mimaghador Physical characteristics: The main mass is partially covered by a black fusion crust. Petrography: (V. Moggi Cecchi, G. Pratesi, S. Caporali, UniFi): A thin section displays a monomict brecciated texture consisting of basaltic eucrite clasts and related crystalline debris occuring in a finer-grained matrix. Eucritic clasts are mainly characterized by clinopyroxene, with minor anorthitic plagioclase and orthopyroxene displaying very fine (1-2 μm width) exsolution lamellae. Minor phases include ilmenite, troilite, chromite, and FeNi metal. Geochemistry: (V. Moggi Cecchi, G. Pratesi, S. Caporali, UniFi) Eucritic clasts: Calcic plagioclase An90.1±1.2Or0.9±0.1, n=6; low-Ca pyroxene (Fs55.2±1.4En42.4±1.2Wo2.4±0.3; n=6; Fe/Mn=37.6±0.3); augite (Fs29.7±1.2En30.6±1.5Wo39.7±1.3; n=7; Fe/Mn=32.8±0.1); pigeonite exsolution lamellae in orthopyroxene (Fs57.7±1.5,En33.8±1.4Wo8.5±0.9; n=8; Fe/Mn = 33.7±0.2). Matrix: low-Ca pyroxene (Fs59.2±1.2En37.6±1.3Wo3.2±0.3; n=7; Fe/Mn=36.7±0.2); Calcic plagioclase An88.7±1.1Or0.5±0.1, n=6; Oxygen isotopes: (I. Franchi, R. Greenwood, OU) δ17O = 1.87‰, δ18O = 4.01‰, Δ17O = -0.21‰ Classification: Eucrite, monomict with high degree of shock and medium degree of weathering. Specimens: A total of 36.2 g specimen and one thin section is on deposit at 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 280 approved meteorites from Western Sahara (plus 20 unapproved names) | ||||||||||||||||||||||||||||||
| Also see: |
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| Revision history: |
This lists important revisions made to data for this record.
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