Meteoritical Bulletin: Entry for Northwest Africa 15723

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Northwest Africa 15723

Basic information

Name: Northwest Africa 15723
This is an OFFICIAL meteorite name.
Abbreviation: NWA 15723
Observed fall: No
Year found: 2022
Country: (Northwest Africa)
Mass: 37 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 23 Feb 2023

Writeup

Writeup from MB 112:

Northwest Africa 15723 (NWA 15723)

(Northwest Africa)

Purchased: June, 2022

Classification: Ureilite

History: Reportedly found by meteorite hunters in Mauritania und subsequently purchased by Mr. Jasper Spencer via Facebook Messenger.

Physical characteristics: Dark brownish rock lacking fusion crust.

Petrography: Coarse-grained protogranular aggregate composed of up to 2 mm rounded to subrounded olivine and pigeonite crystals, both displaying characteristic reduced rims. The meteorite contains graphite, troilite, and mostly altered kamacite.

Geochemistry: reduced rims in olivine: Fa_5.8-9.3; olivine contains 0.51±0.04 wt% Cr₂O₃ and 0.30±0.02 wt% CaO; reduced rims in pyroxene: Fs_2.8-8.3Wo_5.9-9.7; pigeonite contains 1.22±0.03 wt% Cr₂O₃ and 1.82±0.05 wt% Al₂O₃

Data from:
  MB112
  Table 0
  Line 0:

Place of purchase:	Mauritania
Date:	P June, 2022
Mass (g):	37
Pieces:	1
Class:	Ureilite
Shock stage:	low
Weathering grade:	moderate
Fayalite (mol%):	21.7±0.1 (n=10)
Ferrosilite (mol%):	18.0±0.1 (n=10)
Wollastonite (mol%):	11.4±0.1 (n=10)
Classifier:	A. Greshake, MNB
Type spec mass (g):	7.6
Type spec location:	MNB
Main mass:	Jasper Spencer
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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