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Northwest Africa 13643
Basic information Name: Northwest Africa 13643
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13643
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass:help 170 g
Classification
  history:
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 16 Jan 2021
Writeuphelp
Writeup from MB 110:

Northwest Africa 13643 (NWA 13643)

(Northwest Africa)

Purchased: 2020

Classification: Carbonaceous chondrite (CM2)

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

Physical characteristics: Many small dark grayish to black individuals without fusion crust.

Petrography: Brecciated carbonaceous chondrite composed of small (apparent mean diameter about 250 μm) chondrules, chondrule pseudomorphs, mineral fragments, and rare CAIs many of which surrounded by fine-grained dust rims set into abundant fine-grained matrix. Matrix is Fe-rich with abundant Fe-sulfides and rare Ca-carbonates. Low analytical totals of matrix analyses suggest the presence of hydrous phyllosilicates.

Geochemistry: Matrix analyses yield an average total of 78.4±1.4 wt% (5 µm defocused beam, N=10) suggesting the presence of hydrous minerals.

Data from:
  MB110
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2020
Mass (g):170
Pieces:many
Class:CM2
Shock stage:S1
Weathering grade:low
Fayalite (mol%):11.8±18.8 (0.8-62.2, n=15)
Ferrosilite (mol%):1.7±1.1 (0.8-5.0, n=13)
Wollastonite (mol%):1.6±1.3 (0.8-4.7, n=13)
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 Meteoritical Bulletin, no. 110, in preparation (2021)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

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

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