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Northwest Africa 12651
Basic information Name: Northwest Africa 12651
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12651
Observed fall: No
Year found: 2015
Country: Morocco
Mass:help 365 g
Meteoritical Bulletin:  MB 108  (2020)  CM
Recommended:  CM    [explanation]

This is 1 of 33 approved meteorites classified as CM.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), CM chondrites, and CM-CO clan chondrites
Comments: Approved 11 Jun 2019
Writeup from MB 108:

Northwest Africa 12651 (NWA 12651)


Purchased: 2015

Classification: Carbonaceous chondrite (CM)

History: Several stones with a total mass of 365 g (largest 122 g) were purchased in Agadir on 2015 and June, 2016.

Physical characteristics: Two different lithologies are clearly apparent and visible with the naked eyes. The first has a dark gray/black matrix and the other is characterized by is brownish color.

Petrography: S. Ebert, A. Bischoff (IfP): The chondrite consists of about 25 vol% chondrules, chondrule fragments, and CAIs, and about 75 vol% of fine-grained material (matrix, fine grained rims; PCPs) . Mean chondrule apparent diameter is about 300 µm, typical for CM. The chondrules also have typical fine-grained rims.

Geochemistry: Mineral composition and geochemistry: S. Ebert, A. Bischoff (IfP): Olivine Fa6.36±11.4 (n=30). Most chondrule olivines have Fa<4, maximum Fa38. Similarly, most low-Ca pyroxenes are enstatites (Fs<2), but extend up to Fs6.

Classification: S. Ebert, A. Bischoff (IfP): The textural observations suggest a CM classification of this rock. The olivines do not show undulatory extinction (shock stage S1). Low abundances of metals are still visible in chondrules, preferentially enclosed in olivines, and also as rare and very small grains in the matrix. The sample is moderately to strongly weathered.

Specimens: 6.4 g including one polished thin section at the IfP and 20 g at the MNHNP. The main mass is held by Labenne.

Data from:
  Table 0
  Line 0:
Origin or pseudonym:Desert
Place of purchase:Agadir
Date:P 2015
Mass (g):365
Shock stage:S1
Weathering grade:high
Fayalite (mol%):6.36±11.4 (n=30)
Ferrosilite (mol%):1.7±1.3 (n=22)
Wollastonite (mol%):1.8±1.3 (n=22)
Classifier:S. Ebert, A. Bischoff, IfP
Type spec mass (g):26.4
Type spec location:IfP; MNHNP
Main mass:Labenne
Comments:Submitted by Ebert S.
   and collections
IfP: Institut für Planetologie, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany (institutional address; updated 23 Jan 2012)
MNHNP: Museum National d'Histoire Naturelle, IMPMC-CP52, 57 rue Cuvier, 75005 Paris, France, France; Website (institutional address)
Labenne: 23, rue de Esperance, 75013 Paris, France; Website (private address; updated 29 Aug 2012)
References: Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
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     This is 1 of 1847 approved meteorites from Morocco (plus 24 unapproved names) (plus 1 impact crater)

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