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Northwest Africa 10811
Basic information Name: Northwest Africa 10811
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 10811
Observed fall: No
Year found: 2016
Country: Algeria
Mass:help 285 g
Meteoritical Bulletin:  MB 105  (2016)  Eucrite
Recommended:  Eucrite    [explanation]

This is 1 of 569 approved meteorites (plus 1 unapproved name) classified as Eucrite.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 24 Sep 2016
Writeup from MB 105:

Northwest Africa 10811 (NWA 10811)


Purchased: 2016

Classification: HED achondrite (Eucrite)

History: One stone weighing 285.1 g was found in Algeria. Thomas Webb purchased the stone from meteorite dealer in Morocco in February 2016.

Physical characteristics: The stone is lacking an obvious fusion crust. The exterior is irregular in shape and contains numerous depressions that are clasts. The interior viewed from a cut face shows green-colored clasts up to 3.5 cm in diameter set within in a dark-gray matrix containing small vesicles.

Petrography: Description and classification (A. Love, App): Sample is a monomict breccia composed of subrounded clasts of very fine-grained, (pyroxenes and ~200 μm lath-shaped plagioclase) ophitic-textured clasts. Pyroxenes are 50-100 μm and exsolved. Lath-shaped plagioclase crystals are ~200 μm and have been partially converted to maskelynite. Melt matrix is composed of lithic fragments and mineral grains set within a quenched, dark-colored glass. Accessory minerals are ilmenite, troilite, a Si polymorph, chromite.

Geochemistry: (A. Love, App): Augite Fs27.2±1.3Wo42.0±1.6 Fe/Mn=30.2-34.3 N=13 appears as individual grains and exsolution lamellae within orthopyroxene. Orthopyroxene Fs60.6±1.2Wo2.8±1.0 Fe/Mn=31.1-33.4, N=13 also appears as individual grains and exsolution lamellae within Cpx. Anorthite An89.7±0.4 N=5

Classification: Mineralogy, geochemistry and textures are consistent with equilibrated eucrites. Quenched vesicular melt matrix with entrained mineral and lithic clasts indicates this is a monomict eucrite impact melt breccia. Quenched vesicular melt matrix with entrained mineral and lithic clasts indicates this is a monomict eucrite impact melt breccia.

Specimens: Webb holds the main mass. A polished thin section, two slices and two small fragments weighing 20.85g are on deposit at App.

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2016
Mass (g):285.1
Shock stage:moderate
Weathering grade:low
Ferrosilite (mol%):60.6±1.2; 27.2±1.3
Wollastonite (mol%):2.8±1.0; 42.0±1.6
Classifier:A. Love, App
Type spec mass (g):20.8
Type spec location:App
Main mass:TWebb
Comments:Submitted by Anthony Love
   and collections
App: Department of Geology, 572 Rivers St., Appalachian State University, Boone, NC 28608, United States (institutional address; updated 7 Mar 2013)
TWebb: No contact information provided., United States (private address)
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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     This is 1 of 1250 approved meteorites from Algeria (plus 29 unapproved names) (plus 4 impact craters)

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