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Northwest Africa 11486
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:help 7.2 g
Classification
  history:
Meteoritical Bulletin:  MB 106  (2018)  Eucrite
Recommended:  Eucrite    [explanation]

This is 1 of 442 approved meteorites (plus 1 unapproved name) classified as Eucrite.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 21 Nov 2017
Writeuphelp
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:
Place of purchase:Ensisheim
Date:P June 2016
Mass (g):7.2
Pieces:1
Class:Eucrite
Shock stage:medium
Weathering grade:medium
Ferrosilite (mol%):54.9±1.1 (n=7); 25.8±1.2 (n=7); 62.6±1.3 (n=7)
Wollastonite (mol%):2.6±0.3; 44.2±1.5; 7.6±0.4
Classifier:V. Moggi Cecchi, S. Caporali, G. Pratesi, MSN-FI
Type spec mass (g):2.2
Type spec location:MSN-FI
Main mass:Cojocaru
Comments:Submitted by Vanni Moggi Cecchi
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 DELL'UNIVERSITA' DEGLI STUDI DI FIRENZE Via Giorgio La Pira, 4 – 50121 FIRENZE, Italy; Website (institutional address; updated 14 Jan 2015)
UniFi: Università degli Studi di Firenze, P.zza S. Marco, 4 - 50121 Firenze, Italy (institutional address; updated 14 Sep 2013)
Catalogs:
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.
Find references in NASA ADS:
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Geography:

Western Sahara
Coordinates:Unknown.

Statistics:
     This is 1 of 207 approved meteorites from Western Sahara (plus 20 unapproved names)

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