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Northwest Africa 11486 | |||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 11486 This is an OFFICIAL meteorite name. Abbreviation: NWA 11486 Observed fall: No Year found: 2016 Country: Western Sahara Mass: ![]() | ||||||||||||||||||||||||||||
Classification history: |
This is 1 of 587 approved meteorites (plus 1 unapproved name) classified as Eucrite. [show all] Search for other: Achondrites, Eucrites, and HED achondrites | ||||||||||||||||||||||||||||
Comments: | Approved 21 Nov 2017 | ||||||||||||||||||||||||||||
Writeup![]() |
Writeup from MB 106:
Northwest Africa 11486 (NWA 11486) Western Sahara Purchased: June 2016 Classification: HED achondrite (Eucrite) History: A single stone of 7.2 g was found by an anonymous finder in Western Sahara and purchased 2016 in Erfoud by Lucian Cojocaru Physical characteristics: The main mass is partly covered by fusion crust. Petrography: (V. Moggi Cecchi, G. Pratesi, S. Caporal, UniFi) The thin section shows a brecciated texture composed of lithic eucrite clasts in a finer grained matrix. Clasts consists of exsolved orthopyroxene crystals with fine pigeonite exsolution lamellae, 5-7 μm in width, augite, calcic plagioclase, ilmenite, chromite, troilite and FeNi metal. Geochemistry: Eucritic clasts: orthopyroxene host (Fs54.9±1.1Wo2.6±0.3, FeO/MnO = 26.3±0.2, n=4); augite (Fs30.1±1.2Wo44.2±1.5.; n=7; Fe/Mn=22.9±0.2); pigeonite exsolution lamellae in orthopyroxene (Fs62.6±1.3Wo7.6±0.4; n=7; Fe/Mn = 24.7±0.2); Plagioclase An 86.3±1.4Or0.7±0.1, n=7; Oxygen isotopes: (I.Franchi, R.Greenwood, OU) δ17O = 1.83 permil, δ18O = 3.93 permil, δ17O = -0.22 permil. Classification: Monomict eucrite. Medium degree of shock and medium degree of weathering. Specimens: A total of 2.2 g specimen and one thin section are on deposit at MSN-FI. Cojocaru owns the main mass. | ||||||||||||||||||||||||||||
Data from: MB106 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 Gattacceca J., Bouvier A., Grossman J., Metzler K., and Uehara M. (2019) Meteoritical Bulletin, no. 106. Meteorit. Planet. Sci. 54 in press.
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Geography:![]() |
Statistics: This is 1 of 270 approved meteorites from Western Sahara (plus 20 unapproved names) |