Meteoritical Bulletin: Entry for Northwest Africa 15798

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Northwest Africa 15798

Basic information

Name: Northwest Africa 15798
This is an OFFICIAL meteorite name.
Abbreviation: NWA 15798
Observed fall: No
Year found: 2023
Country: (Northwest Africa)
Mass: 410 g

Classification
history:

Recommended:

Ureilite [explanation]

This is 1 of 625 approved meteorites classified as Ureilite. [show all]
Search for other: Achondrites, Ureilites

Comments:

Approved 4 Mar 2023

Writeup

Writeup from MB 112:

Northwest Africa 15798 (NWA 15798)

(Northwest Africa)

Purchased: Jan 2023

Classification: Ureilite

History: The meteorite was purchased from a group of meteorites hunters in Nouadhibou, Mauritania in January, 2023.

Physical characteristics: Dark brownish rock without fusion crust.

Petrography: The meteorite displays a protogranular texture of up to 3 mm sized olivine and pigeonite grains both showing characteristic reduced rims associated with fine-grained often altered FeNi-metal. The meteorite contains graphite and iron oxide veins decorating grain boundaries.

Geochemistry: reduced rims in olivine: Fa_3.3-5.0; olivine contains 0.56±0.14 wt% Cr₂O₃ and 0.30±0.01 wt% CaO; reduced rims in pyroxene: Fs_9.2-15.6Wo_4.3-8.9; pigeonite contains 1.12±0.04 wt% Cr₂O₃ and 1.32±0.07 wt% Al₂O₃

Data from:
  MB112
  Table 0
  Line 0:

Place of purchase:	Nouadhibou, Mauritania
Date:	P Jan 2023
Mass (g):	410
Pieces:	1
Class:	Ureilite
Shock stage:	low
Weathering grade:	high
Fayalite (mol%):	21.2±0.1 (n=10)
Ferrosilite (mol%):	18.1±0.2 (n=10)
Wollastonite (mol%):	9.2±0.1 (n=10)
Classifier:	A. Greshake, MNB
Type spec mass (g):	62.2
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. 112, in preparation (2023)

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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9042 approved meteorites from (Northwest Africa) (plus 1870 unapproved names)

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