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| Northwest Africa 10786 | |||||||||||||||||||||||||||||||
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| Basic information | Name: Northwest Africa 10786 This is an OFFICIAL meteorite name. Abbreviation: NWA 10786 Observed fall: No Year found: 2015 Country: Western Sahara Mass:  433 g | ||||||||||||||||||||||||||||||
| Classification history: |
This is 1 of 487 approved meteorites classified as LL3. [show all] Search for other: LL chondrites, LL chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3) | ||||||||||||||||||||||||||||||
| Comments: | Approved 1 Aug 2016 | ||||||||||||||||||||||||||||||
| Writeup |
Writeup from MB 105:
Northwest Africa 10786 (NWA 10786) Western Sahara Purchased: Oct 2015 Classification: Ordinary chondrite (LL3) History: Collected by nomads in Western Sahara and purchased by Mario Di Martino at the Torino Mineral Fair in October 2015 from a Moroccan dealer. Physical characteristics: Single stone, dark brown crust. The sawn surface shows a medium grained, brown chondritic matrix. Petrography: (V. Moggi Cecchi, G. Pratesi, S. Caporali, UniFi) The thin section displays a medium-grained matrix with several chondrules. The matrix is mainly consisting of pyroxene and olivine, with minor plagioclase.Chondrules range from 250 to 800 μm in diameter. Chondrules types are various (BO, PO, PP and C). Opaque phases, mainly consisting of kamacite, taenite with minor troilite and iron oxides/hydroxides, account for about 5% of the total area. Distinct chondrules and the variability of Fa and Fs contents point to high petrologic type 3. Geochemistry: (V. Moggi Cecchi, G. Pratesi, S. Caporali, UniFi) Chondrules: olivine (Fa27.0±4.6, Fe/Mn=61±6, n=14; MD=1.4 PMD=5.7); low-Ca pyroxene (Fs19.0±6.9En80.5±7.0Wo0.5±0.1; Fe/Mn=32±2, n=7; MD=1.6 PMD=12.4); matrix: low-Ca pyroxene (Fs24.0±0.2En74.0±0.2Wo2.0±0.5; Fe/Mn=40±1, n=5; MD=0.2 PMD=0.9); diopside (Fs17.3En79.4Wo3.3; 1.6 Al2O3, 0.8 Cr2O3, 0.3 MnO, all wt. %); Oxygen isotopes: (I. Franchi, R. Greenwood, OU) δ17O = 3.66 ‰, δ18O = 5.28 ‰, Δ17O = 0.91 ‰ Classification: Ordinary Chondrite (LL3); S1; W2; Specimens: A total of 38.0 g specimen and one thin section are on deposit at MSN-FI. Di Martino holds 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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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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