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Northwest Africa 11157
Basic information Name: Northwest Africa 11157
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11157
Observed fall: No
Year found: 2016
Country: (Northwest Africa)
Mass:help 661 g
Classification
  history:
Meteoritical Bulletin:  MB 106  (2018)  Eucrite-br
Recommended:  Eucrite-br    [explanation]

This is 1 of 179 approved meteorites classified as Eucrite-br.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 4 Mar 2017
Writeuphelp
Writeup from MB 106:

Northwest Africa 11157 (NWA 11157)

(Northwest Africa)

Purchased: 2016

Classification: HED achondrite (Eucrite, brecciated)

History: The meteorite was bought in 2016 from a Moroccan meteorite dealer at a mineral fair in Munich, Germany.

Physical characteristics: Dark grayish individual lacking any fusion crust.

Petrography: The meteorite is a fragmental breccia composed of rare basaltic clasts with different grain sizes and impact melt clasts set into a clastic matrix. Basaltic clasts and matrix are dominantly composed of exsolved pyroxene and plagioclase grains of variable grain sizes ranging from 30 to 500 μm. Several matrix pyroxenes display magmatic zoning. Minor phases include chromite, ilmenite, pyrrhotite, silica and metallic iron.

Geochemistry: low-Ca pyroxene: Fs38.4±7.7Wo6.2±0.6 (Fs29.7-50.8Wo5.1-7.1, n=20, FeO/MnO=25-32); Ca-pyroxene: Fs29.0±4.6Wo38.4±1.1 (Fs19.4-34.1Wo37.0-41.2, n=12, FeO/MnO=25-34); calcic plagioclase: An87.0±4.1 (An73.5-89.5, n=14)

Data from:
  MB106
  Table 0
  Line 0:
Place of purchase:Munich, Germany
Date:P 2016
Mass (g):661
Pieces:1
Class:Eucrite-br
Shock stage:moderate
Weathering grade:low
Ferrosilite (mol%):38.4; 29.0
Wollastonite (mol%):6.2; 38.4
Classifier:A. Greshake, MNB
Type spec mass (g):20
Type spec location:MNB
Main mass:Philippe Schmitt-Kopplin
Comments:Submitted by Ansgar Greshake
Institutions
   and collections
MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011)
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: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7385 approved meteorites from (Northwest Africa) (plus 1955 unapproved names)

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