Meteoritical Bulletin: Entry for Northwest Africa 15909

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Northwest Africa 15909

Basic information

Name: Northwest Africa 15909
This is an OFFICIAL meteorite name.
Abbreviation: NWA 15909
Observed fall: No
Year found: 2023
Country: (Northwest Africa)
Mass: 695 g

Classification
history:

Recommended:

Ureilite [explanation]

This is 1 of 627 approved meteorites classified as Ureilite. [show all]
Search for other: Achondrites, Ureilites

Comments:

Approved 7 May 2023

Writeup

Writeup from MB 112:

Northwest Africa 15909 (NWA 15909)

(Northwest Africa)

Purchased: 2023

Classification: Ureilite

History: The meteorite was purchased from a meteorite dealer in Algeria.

Physical characteristics: Dark brownish rock with some fusion crust.

Petrography: Coarse-grained protogranular aggregate composed of up to 3 mm angular to subrounded interlocking olivine and pigeonite crystals, both displaying characteristic reduced rims. The meteorite contains graphite, troilite, and partly altered kamacite.

Geochemistry: olivine cores: Fa_18.9±0.1(Fa_18.7-19.2, n=10), contain 0.74±0.03 wt% Cr₂O₃ and 0.36±0.02 wt% CaO; reduced rims in olivine: Fa_3.1-5.3; low Ca-pyroxene: Fs_15.6±0.2Wo_11.5±0.1(Fs_15.4-16.1Wo_11.3-11.8, n=10), contains 1.24±0.03 wt% Cr₂O₃ and 0.74±0.04 wt% Al₂O₃; reduced rims in pyroxene: Fs_6.4-13.0Wo_5.8-12.6

Data from:
  MB112
  Table 0
  Line 0:

Place of purchase:	Algeria
Date:	P 2023
Mass (g):	695
Pieces:	1
Class:	Ureilite
Shock stage:	low
Weathering grade:	low
Fayalite (mol%):	18.9
Ferrosilite (mol%):	15.6
Wollastonite (mol%):	11.5
Classifier:	A. Greshake, MNB
Type spec mass (g):	27.8
Type spec location:	MNB
Main mass:	Chnaoui Larbi
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 9092 approved meteorites from (Northwest Africa) (plus 1875 unapproved names)

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