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Northwest Africa 11457
Basic information Name: Northwest Africa 11457
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11457
Observed fall: No
Year found: 2016
Country: Algeria
Mass:help 273 g
Meteoritical Bulletin:  MB 106  (2018)  Lunar (feldsp. breccia)
Recommended:  Lunar (feldsp. breccia)    [explanation]

This is 1 of 312 approved meteorites classified as Lunar (feldsp. breccia).   [show all]
Search for other: Lunar meteorites
Comments: Approved 13 Oct 2017
Writeup from MB 106:

Northwest Africa 11457 (NWA 11457)


Purchased: May 2016

Classification: Lunar meteorite (feldspathic breccia)

History: Seven pieces with a total mass of 273 g were purchased form a Moroccan dealer in Ouarzazate, Morocco May 2016. The sample may have been found in Algeria and brought by nomads to a dealer in Zwirate in the north of Mauritania.

Physical characteristics: Physical Characteristics: The susceptibility values (J. Gattacceca, CEREGE) for the four largest samples are as follows: log χ (× 10-9 m3/kg) = 3.31 (117.7g sample); log χ (× 10-9 m3/kg) = 3.56 (88.64 g sample); log χ (× 10-9 m3/kg) = 3.25 (39.91 g sample); log χ (× 10-9 m3/kg) = 3.25 (15.34 g sample).

Petrography: (A.-K. Kraemer and A. Bischoff, IfP) Breccia composed of angular anorthite-rich lithic and mineral fragments embedded in a fine-grained clastic matrix. Observed minerals include anorthite, olivine, low-Ca pyroxene, Ca-rich pyroxene, silica polymorph, Al-Ti-chromite, kamacite, ilmenite, troilite, pendlandite and schreibersite. Calcite veins indicate moderate degree of weathering.

Geochemistry: Mineral compositions and geochemistry: Olivine (mean: Fa48.2, Fe/Mn = 101; N = 199), low-Ca pyroxene (mean Fs35.4Wo12.4, Fe/Mn = 62, 22,9 N = 199), Ca-rich pyroxene (mean: Fs30.7Wo35.2; Fe/Mn = 69; N = 73), anorthite (mean An92.7Or0.3, N = 201).

Classification: Lunar (feldspathic breccia)

Specimens: 22.9 g and thin sections. Main Mass with Ben Hoefnagels.

Data from:
  Table 0
  Line 0:
Origin or pseudonym:Desert
Place of purchase:Ouarzazate, Morocco
Date:P May 2016
Mass (g):273
Class:Lunar (feldsp. breccia)
Shock stage:high
Weathering grade:moderate
Fayalite (mol%):48.2 ± 25.2 (12.8-99.9, N=199)
Ferrosilite (mol%):35.4 ± 12.9 (17.2-80.6, N=199)
Wollastonite (mol%):12.4 ± 5.9 (2.5-24.9, N=199)
Magnetic suscept.:3.25 - 3.56
Classifier:A.-K. Kraemer and A. Bischoff, IfP
Type spec mass (g):22.9
Type spec location:IfP
Main mass:Ben Hoefnagels
Comments:Work name BH029; submitted by Samuel Ebert
   and collections
CEREGE: CEREGE BP 80 Avenue Philibert, Technopole de l'Arbois 13545 Aix-en-Provence Cedex 4 France, France (institutional address; updated 29 Oct 2018)
IfP: Institut für Planetologie, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany (institutional address; updated 23 Jan 2012)
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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     This is 1 of 1270 approved meteorites from Algeria (plus 29 unapproved names) (plus 4 impact craters)

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