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Northwest Africa 13557
Basic information Name: Northwest Africa 13557
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13557
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass:help 20 g
Classification
  history:
Recommended:  CK6    [explanation]

This is 1 of 82 approved meteorites classified as CK6.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (equilibrated), CK chondrites, CK chondrites (type 4-6), and CV-CK clan chondrites
Comments: Approved 28 Nov 2020
Writeuphelp
Writeup from MB 109:

Northwest Africa 13557 (NWA 13557)

(Northwest Africa)

Purchased: 2020

Classification: Carbonaceous chondrite (CK6)

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

Physical characteristics: Dark-grayish fragment partly covered by fusion crust.

Petrography: The meteorite displays a dark-grayish interior and is predominantly composed of fine-grained recrystallized matrix dominated by ferrous olivine. Chondrules are only rarely encountered. One CAI is present in the section studies. Minor phases include intermediate plagioclase, low-Ca pyroxene, Ca-pyroxene, and FeNi-sulfides. Cr-rich magnetite is abundant; no metal has been found.

Geochemistry: olivine: Fa30.0±0.2 (FeO/MnO=96±10, n=12); low-Ca pyroxene: Fs25.9±1.0Wo0.9±0.1, n=10; Ca-pyroxene: Fs16.0±1.4Wo48.7±0.4, n=10

Data from:
  MB109
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2020
Mass (g):20
Pieces:1
Class:CK6
Shock stage:S2
Weathering grade:low
Fayalite (mol%):30.0
Ferrosilite (mol%):25.9;16.0
Wollastonite (mol%):0.9; 48.7
Classifier:A. Greshake, MNB
Type spec mass (g):4.1
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. 109, in preparation (2020)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9368 approved meteorites from (Northwest Africa) (plus 1875 unapproved names)

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