Meteoritical Bulletin: Entry for Northwest Africa 15942

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Northwest Africa 15942

Basic information

Name: Northwest Africa 15942
This is an OFFICIAL meteorite name.
Abbreviation: NWA 15942
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass: 657 g

Classification
history:

Meteoritical Bulletin:	MB 112	(2024)	Eucrite-melt breccia
Recommended:			Eucrite-melt breccia [explanation]

This is 1 of 115 approved meteorites classified as Eucrite-melt breccia. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Comments:

Approved 10 Jun 2023

Writeup

Writeup from MB 112:

Northwest Africa 15942 (NWA 15942)

(Northwest Africa)

Purchased: 2020

Classification: HED achondrite (Eucrite, melt breccia)

Petrography: (K. Metzler, IfP) Clast-rich melt rock, consisting of mm- to cm-sized basaltic clasts and related debris (pyroxene and plagioclase fragments), embedded in a crystallized melt. Most pyroxene grains show augite exsolution lamellae. The entire rock is extensively recrystallized, consisting of subgrains with sizes mostly <50 µm. Accessories are chromium spinel, ilmenite, and troilite.

Geochemistry: Mineral compositions and geochemistry: Mean composition of low-Ca pyroxene: Fs_62.6±0.4Wo_2.5±0.3(Fs_62.1-63.3Wo_2.1-2.9); mean Fe/Mn (at.): 32; n=10. Mean composition of high-Ca pyroxene: Fs_27.1±0.4Wo_42.8±0.3(Fs_26.6-27.8Wo_42.4-43.2); mean Fe/Mn (at.): 31; n=10. Mean plagioclase composition: An_88±4.6Or_0.4±0.4(An_80.1-94.1Or_0.0-1.6); n=11.

Classification: Eucrite (clast-rich melt rock)

Data from:
  MB112
  Table 0
  Line 0:

Place of purchase:	Morocco
Date:	P 2020
Mass (g):	657
Pieces:	1
Class:	Eucrite-melt breccia
Shock stage:	High
Weathering grade:	Moderate
Ferrosilite (mol%):	62.6±0.4; 27.1±0.4
Wollastonite (mol%):	2.5±0.3; 42.8±0.3
Classifier:	K. Metzler, IfP
Type spec mass (g):	20
Type spec location:	IfP
Main mass:	John Shea, Minneapolis, USA
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 Gattacceca J., McCubbin F. M., Grossman J. N., Schrader D. L., Cartier C., Consolmagno G., Goodrich C., Greshake A., Gross J., Joy K. H., Miao B. and Zhang B. (2024) The Meteoritical Bulletin, no. 112. Meteoritics & Planetary Science 59, 1820–1823. ?

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Photos:

Credit	Photos
Public domain photographs:
Knut Metzler

Geography:

Coordinates:

Unknown.

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

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