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Northwest Africa 12742
Basic information Name: Northwest Africa 12742
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12742
Observed fall: No
Year found: 2018
Country: (Northwest Africa)
Mass:help 10 g
Classification
  history:
Recommended:  CM2    [explanation]

This is 1 of 533 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 27 Jul 2019
Writeuphelp
Writeup from MB 108:

Northwest Africa 12742 (NWA 12742)

(Northwest Africa)

Purchased: 2018

Classification: Carbonaceous chondrite (CM2)

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

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

Petrography: The meteorite is a chondritic 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 most of which are surrounded by fine-grained dust rims.

Data from:
  MB108
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2018
Mass (g):10
Pieces:many
Class:CM2
Shock stage:S1
Weathering grade:W2
Fayalite (mol%):20.0±25.0 (0.5-68.3, n=20)
Ferrosilite (mol%):5.2±4.6 (1.0-11.4, n=16)
Wollastonite (mol%):1.6±0.7 (0.9-3.6, n=16)
Classifier:A. Greshake, MNB
Type spec mass (g):2
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. 108, in preparation (2019)
Find references in NASA ADS:
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Photos:
CreditPhotos
Public domain photographs:
Ansgar Greshake      
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7027 approved meteorites from (Northwest Africa) (plus 2002 unapproved names)

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