Meteoritical Bulletin: Entry for Northwest Africa 13947

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Northwest Africa 13947

Basic information

Name: Northwest Africa 13947
This is an OFFICIAL meteorite name.
Abbreviation: NWA 13947
Observed fall: No
Year found: 2021
Country: (Northwest Africa)
Mass: 310 g

Classification
history:

Recommended:

Ureilite [explanation]

This is 1 of 604 approved meteorites classified as Ureilite. [show all]
Search for other: Achondrites, Ureilites

Comments:

Approved 6 May 2021

Writeup

Writeup from MB 110:

Northwest Africa 13947 (NWA 13947)

(Northwest Africa)

Purchased: January, 2021

Classification: Ureilite

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

Physical characteristics: Brownish rock without fusion crust.

Petrography: The meteorite shows a poikilitic texture consisting of large up to 2.5 mm sized orthopyroxene crystals enclosing rounded olivine grains. Olivine displays characteristic reduced rims where in contact with FeNi-metal or flaky graphite. Some cracks are filled with secondary calcite.

Geochemistry: reduced rims in olivine: Fa_4.8-7.3; olivine contains 0.50±0.02 wt% Cr₂O₃ and 0.26±0.01 wt% CaO; pigeonite contains 1.30±0.04 wt% Cr₂O₃ and 1.57±0.05 wt% Al₂O₃

Classification: ureilite (olivine? orthopyroxene type)

Data from:
  MB110
  Table 0
  Line 0:

Place of purchase:	Nouadhibou, Mauritania
Date:	P January, 2021
Mass (g):	310
Pieces:	1
Class:	Ureilite
Shock stage:	low
Weathering grade:	moderate
Fayalite (mol%):	21.5±0.1 (n=7)
Ferrosilite (mol%):	18.0±0.2 (n=7)
Wollastonite (mol%):	4.4±0.1 (n=7)
Classifier:	A. Greshake, MNB
Type spec mass (g):	48
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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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 8390 approved meteorites from (Northwest Africa) (plus 1899 unapproved names)

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