Meteoritical Bulletin: Entry for Northwest Africa 13950

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Northwest Africa 13950

Basic information

Name: Northwest Africa 13950
This is an OFFICIAL meteorite name.
Abbreviation: NWA 13950
Observed fall: No
Year found: 2021
Country: (Northwest Africa)
Mass: 200 g

Classification
history:

Recommended:

CR2 [explanation]

This is 1 of 181 approved meteorites classified as CR2. [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), and CR chondrites

Comments:

Approved 18 Sep 2021

Writeup

help

Writeup from MB 110:

Northwest Africa 13950 (NWA 13950)

(Northwest Africa)

Purchased: 2021 Jan

Classification: Carbonaceous chondrite (CR2)

History: The meteorite was purchased from a meteorite dealer in Nouadhibou, Mauritania, in late January, 2021.

Physical characteristics: Seventeen brownish fragments without fusion crust.

Petrography: The meteorite is composed of abundant large and mostly porphyritic type I chondrules (apparent mean diameter about 700 μm) set into a fine-grained iron-rich matrix. Few type II chondrules but no CAIs have been found in the two sections studied. Type I chondrules are often metal-decorated and contain abundant metal blebs. Type II chondrules contain sulfides and very rare metal. The matrix contains framboids of ~1 μm-sized round to euhedral magnetite grains and low analytical totals suggest presence of hydrous mineral phases.

Geochemistry: olivine in type I chondrules: Fa_2.5±1.4(Fa_1.1-5.4, Cr₂O₃: 0.65±0.08 wt%, n=20; low-Ca pyroxene: Fs_2.3±1.3Wo_1.3±0.7(Fs_1.2-4.9Wo_0.8-3.2, n=13); Fe-rich olivine grains: Fa_37.8±6.1(Fa_32.0-49.9, n=6). Matrix analyses yield an average total of 87.8±0.7 wt% (5 μm defocused beam, n=5) suggesting the presence of hydrous minerals.

Data from:
  MB110
  Table 0
  Line 0:

Place of purchase:	Nouadhibou, Mauritania
Date:	P 2021 Jan
Mass (g):	200
Pieces:	17
Class:	CR2
Shock stage:	S2
Weathering grade:	W3
Fayalite (mol%):	2.5; 37.8
Ferrosilite (mol%):	2.3
Wollastonite (mol%):	1.3
Classifier:	A. Greshake, MNB
Type spec mass (g):	25.8
Type spec location:	MNB
Main mass:	Salamu Ali
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)

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Photos:

Credit	Photos
Public domain photographs:
Ansgar Greshake

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 8394 approved meteorites from (Northwest Africa) (plus 1899 unapproved names)

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