Meteoritical Bulletin: Entry for Northwest Africa 16461

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Northwest Africa 16461

Basic information

Name: Northwest Africa 16461
This is an OFFICIAL meteorite name.
Abbreviation: NWA 16461
Observed fall: No
Year found: 2022
Country: (Northwest Africa)
Mass: 760 g

Classification
history:

Recommended:

Ureilite [explanation]

This is 1 of 676 approved meteorites classified as Ureilite. [show all]
Search for other: Achondrites, Ureilites

Comments:

Approved 22 Jan 2024

Writeup

help

Writeup from MB 113:

Northwest Africa 16461 (NWA 16461)

(Northwest Africa)

Purchased: 2022

Classification: Ureilite

History: Purchased in 2022 by Chris Monk from Younes Chaoui.

Physical characteristics: Single weathered stone with minor fusion crust.

Petrography: (D. Sheikh, Cascadia) Sample has a protogranular texture comprised primarily of mm-sized olivine grains (Av. ~1 mm), and minor pigeonite, displaying 120 degree triple junctions. Olivine displays thin reduction rims at grain edges, usually in contact with Fe-Ni metal (occurring as either veinlets or blebs). Other phases identified include interstitial graphite and troilite.

Geochemistry: Olivine cores (Fa_21.9±0.4, range Fa_20.8-22.4, Cr₂O₃=0.75±0.03 wt. %, CaO=0.36±0.02 wt. %, MnO=0.45±0.04 wt. %, FeO/MnO=44±4, n=26), Olivine rims (range Fa_9.8-19.6, n=16), Pigeonite (Fs_10.7±4.8Wo_8.3±1.7, range Fs_4.2-18.8Wo_5.0-10.7, Al₂O₃=0.41±0.20 wt. %, Cr₂O₃=1.13±0.12 wt. %, MnO=0.51±0.05 wt. %, FeO/MnO=13±6, n=10).

Classification: Ureilite.

Specimens: 22.52 g type specimen at Cascadia, main mass with Chris Monk.

Data from:
  MB113
  Table 0
  Line 0:

Place of purchase:	Northwest Africa
Date:	P 2022
Mass (g):	760
Pieces:	1
Class:	Ureilite
Shock stage:	low
Weathering grade:	moderate
Fayalite (mol%):	21.9±0.4
Ferrosilite (mol%):	10.7±4.8
Wollastonite (mol%):	8.3±1.7
Classifier:	D. Sheikh, Cascadia
Type spec mass (g):	22.52
Type spec location:	Cascadia
Main mass:	Chris Monk
Comments:	CML 1615, CM025; submitted by Daniel Sheikh

Institutions
and collections

Cascadia: Cascadia Meteorite Laboratory, Portland State University, Department of Geology, Room 17 Cramer Hall, 1721 SW Broadway, Portland, OR 97201, United States; Website (institutional address; updated 28 Oct 2011)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 113, in preparation (2024)

Find references in NASA ADS:
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Photos:

Credit	Photos
Public domain photographs:
Daniel Sheikh

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9933 approved meteorites from (Northwest Africa) (plus 1837 unapproved names)

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