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Northwest Africa 12727 | |||||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 12727 This is an OFFICIAL meteorite name. Abbreviation: NWA 12727 Observed fall: No Year found: 2018 Country: Morocco Mass: 4.53 kg | ||||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 474 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 12 Dec 2020 | ||||||||||||||||||||||||||||||||
Writeup |
Writeup from MB 109:
Northwest Africa 12727 (NWA 12727) Morocco Purchased: 2018 Classification: Ordinary chondrite (LL3) History: Collected by nomads in Western Sahara and purchased by Giorgio Tomelleri at the Erfoud market in 2018 from a Moroccan dealer. Physical characteristics: A single piece weighing 4560 g with a black fusion crust. The cut surface appears weakly weathered and displays scattered CAIs. Petrography: (V. Moggi Cecchi, G. Pratesi, S. Caporali, UniFi); The thin section displays a chondritic texture, with PO and POP chondrules ranging from 800 to 1200 μm in a fine grained matrix. PO chondrules display zoned olivine crystals. POP chondrules display olivine grains and elongated pyroxene grains. Olivine is markedly inhomogenesous and Mg-rich in chondrules, while Fe-rich in the matrix. Orthopyroxene in chondrules is inhomogeneous, with a core-rim variability. Plagioclase is Na and K-rich. Opaque phases are consisting of iron oxides, Fe-Ni alloys and troilite as individual grains scattered in the matrix or rimming chondrules. Geochemistry: EMP (V. Moggi Cecchi, G. Pratesi, S. Caporali, UniFi); Olivine in chondrules (Fa14.5±9.5Fo85.5±9.5; Fe/Mn = 63.0, n=33 ); Olivine in matrix (Fa34.3±1.4Fo65.6±1.7 Fe/Mn = 62.9, n=10); Orthopyroxene in chondrules (Fs11.1±7.0En88.2±6.8Wo0.7±0.1, Fe/Mn = 25.2, n=15); Orthopyroxene in matrix (Fs25.4±1.5En72.7±1.3Wo1.9±0.1, Fe/Mn = 34.3, n=6); plagioclase (An40.1Or46.7); Oxygen isotopes (I. Franchi, R.Greenwood, OU): δ17O = 3.99, δ18O = 5.79, Δ17O = 0.973, all permil. Classification: Ordinary Chondrite (LL3); S2; W2. Estimated subtype LL3.3. Specimens: A total of 21.7 g specimen is on deposit at MSN-FI, Inv.#3456-I). Tomelleri holds the main mass. | ||||||||||||||||||||||||||||||||
Data from: MB109 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. 109, in preparation (2020)
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Geography: |
Statistics: This is 1 of 2049 approved meteorites from Morocco (plus 31 unapproved names) (plus 1 impact crater) | ||||||||||||||||||||||||||||||||
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Revision history: |
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