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Northwest Africa 11791
Basic information Name: Northwest Africa 11791
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11791
Observed fall: No
Year found: 2017
Country: (Northwest Africa)
Mass:help 17.1 g
Classification
  history:
Meteoritical Bulletin:  MB 107  (2018)  CM2
Recommended:  CM2    [explanation]

This is 1 of 544 approved meteorites classified as CM2.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), CM chondrites, and CM-CO clan chondrites
Comments: Approved 26 May 2018
Writeuphelp
Writeup from MB 107:

Northwest Africa 11791 (NWA 11791)

(Northwest Africa)

Purchased: 2017

Classification: Carbonaceous chondrite (CM2)

History: The meteorite was bought from a local meteorite dealer in Morocco.

Physical characteristics: Six black fragments partly covered with fusion crust.

Petrography: The meteorite is a breccia dominated by fine-grained almost opaque matrix composed of phyllosilicates, Fe-sulfides, Ca-carbonates and rare FeNi metal. Embedded in this matrix are chondrules (mean diameter about 300 μm), chondrule pseudomorphs, mineral fragments, and rare CAIs some of which are surrounded by fine-grained dust rims.

Data from:
  MB107
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2017
Mass (g):17.1
Pieces:6
Class:CM2
Shock stage:S1
Weathering grade:moderate
Fayalite (mol%):22.0±21.9 (0.8-66.8, n=25)
Ferrosilite (mol%):1.7±1.0 (1.1-4.3, n=15)
Wollastonite (mol%):1.0±0.7 (1.3-0.8, n=15)
Classifier:A. Greshake, MNB
Type spec mass (g):3.5
Type spec location:MNB
Main mass:Vincent Gira
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 Meteoritical Bulletin, no. 107, MAPS 55, 460-462
Find references in NASA ADS:
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Photos:
CreditPhotos
Public domain photographs:
Ansgar Greshake      
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7579 approved meteorites from (Northwest Africa) (plus 1969 unapproved names)

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