Meteoritical Bulletin: Entry for Northwest Africa 13456

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Northwest Africa 13456

Basic information

Name: Northwest Africa 13456
This is an OFFICIAL meteorite name.
Abbreviation: NWA 13456
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass: 169 g

Classification
history:

Meteoritical Bulletin:	MB 109	(2020)	C2
Recommended:			C2 [explanation]

This is 1 of 2 approved meteorites classified as C2. [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2)

Comments:

Approved 17 Dec 2020

Writeup

help

Writeup from MB 109:

Northwest Africa 13456 (NWA 13456)

(Northwest Africa)

Purchased: 2019

Classification: Carbonaceous chondrite (C2)

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

Physical characteristics: Almost black individual with some fusion crust.

Petrography: The meteorite displays a black interior, appears to be unbrecciated and is composed of chondrules with mean apparent diameter 150±80 µm (N=48), mineral fragments, and CAIs set into an abundant fine-grained matrix. Most components are surrounded by fine-grained dust rims and many chondrules are heavily corroded. The matrix is a network of very Fe-rich phases including abundant Fe-sulfides and fibrous phyllosilicates. Carbonates are absent.

Geochemistry: Mean values of defocused matrix analyses (beam diameter 5 µm; all wt%; N=12): SiO₂: 19.4, TiO₂: 0.03, Na₂O: 0.24, Cr₂O₃: 0.20, MgO: 7.3, MnO: 0.14, CaO: 0.08, FeO: 49.7, Al₂O₃: 3.08, NiO: 1.41, P₂O₅: 0.62, S: 1.62, Total: 83.82. Oxygen isotopes (K. Ziegler, UNM): 3 acid-washed fragments analyzed by laser fluorination gave: δ¹⁸O=0.913, 0.886, 1.678; δ¹⁷O=-3.171, -4.028, -3.953; Δ¹⁷O= -3.653, -4.496, -4.838 (all per mil).

Classification: Carbonaceous chondrite (C2). Type 2 designation due to the presence of phyllosilicates. Oxygene isotopic composition is incompatible with CM.

Data from:
  MB109
  Table 0
  Line 0:

Place of purchase:	Guelmim, Morocco
Date:	P 2019
Mass (g):	169
Pieces:	1
Class:	C2
Shock stage:	S1
Weathering grade:	low
Fayalite (mol%):	12.2±17.3 (0.8-58.1, n=17)
Ferrosilite (mol%):	10.5±14.2 (1.1-48.0, n=16)
Wollastonite (mol%):	2.5±0.9 (1.0-4.3, n=16)
Magnetic suscept.:	3.48
Classifier:	A. Greshake, MNB
Type spec mass (g):	20.3
Type spec location:	MNB
Main mass:	Larbi Chnaoui
Comments:	Submitted by Ansgar Greshake

Plots:

O isotopes:

Institutions
and collections

MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011)
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 109, in preparation (2020)

Find references in NASA ADS:
Find references in Google Scholar:

Photos:

Credit	Photos
Public domain photographs:
Ansgar Greshake

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9699 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

Also see:

This lists the most popular meteorites among people who looked up this meteorite.

Revision
history:

This lists important revisions made to data for this record.

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