Meteoritical Bulletin: Entry for Northwest Africa 15522

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Northwest Africa 15522

Basic information

Name: Northwest Africa 15522
This is an OFFICIAL meteorite name.
Abbreviation: NWA 15522
Observed fall: No
Year found: 2022
Country: (Northwest Africa)
Mass: 11.8 kg

Classification
history:

Meteoritical Bulletin:	MB 112	(2023)	Eucrite-melt breccia
Recommended:			Eucrite-melt breccia [explanation]

This is 1 of 106 approved meteorites classified as Eucrite-melt breccia. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Comments:

Approved 7 Jan 2023

Writeup

Writeup from MB 112:

Northwest Africa 15522 (NWA 15522)

(Northwest Africa)

Purchased: 2022

Classification: HED achondrite (Eucrite, melt breccia)

Petrography: (K. Metzler, IfP) Clast-rich melt rock, consisting of mm-sized basalt clasts and related debris (pyroxene and plagioclase fragments), embedded in a crystallized vesicular melt. The entire rock is thermally recrystallized, consisting of subgrains with sizes mostly <50 µm. Most subgrains in pyroxene are unequilibrated and chemically zoned. Accessories are ilmenite, chromium spinel, and a silica polymorph.

Geochemistry: Mineral compositions and geochemistry: Mean pyroxene composition: Fs_46.4±4.0Wo_12.2±2.3(Fs_41.3-53.0Wo_8.4-16.7); mean Fe/Mn (at.): 29.6; n=11. Mean plagioclase composition: An_88.8±3.8Or_0.2±0.3(An_80.1-91.9Or_0.0-0.7); n=11.

Classification: Eucrite (clast-rich melt rock)

Data from:
  MB112
  Table 0
  Line 0:

Place of purchase:	Mauritania
Date:	P 2022
Mass (g):	11800
Pieces:	1
Class:	Eucrite-melt breccia
Shock stage:	high
Weathering grade:	low
Ferrosilite (mol%):	46.4±4.0
Wollastonite (mol%):	12.2±2.3
Classifier:	K. Metzler, IfP
Type spec mass (g):	20
Type spec location:	IfP
Main mass:	Alali Sid Alarbi
Comments:	Submitted by K. Metzler, IfP

Institutions
and collections

IfP: Institut für Planetologie, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany (institutional address; updated 23 Jan 2012)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 112, in preparation (2023)

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Photos:

Credit	Photos
Public domain photographs:
Knut Metzler

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9710 approved meteorites from (Northwest Africa) (plus 1853 unapproved names)

Also see:

This lists the most popular meteorites among people who looked up this meteorite.

Revision
history:

This lists important revisions made to data for this record.

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