Meteoritical Bulletin: Entry for Northwest Africa 12342

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Northwest Africa 12342

Basic information

Name: Northwest Africa 12342
This is an OFFICIAL meteorite name.
Abbreviation: NWA 12342
Observed fall: No
Year found: 2018
Country: (Northwest Africa)
Mass: 526 g

Classification
history:

Meteoritical Bulletin:	MB 107	(2018)	Eucrite-melt breccia
Recommended:			Eucrite-melt breccia [explanation]

This is 1 of 76 approved meteorites classified as Eucrite-melt breccia. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Comments:

Approved 14 Dec 2018

Writeup

help

Writeup from MB 107:

Northwest Africa 12342 (NWA 12342)

(Northwest Africa)

Purchased: 2018 Aug

Classification: HED achondrite (Eucrite, melt breccia)

Petrography: (K. Metzler, IfP) Subrounded eucritic lithic clasts (up to 2 cm) with ophitic to subophitic textures and mineral fragments (pyroxene, plagioclase, silica polymorph) embedded in a vesicular crystallized melt. The modal amount of melt is 30-50 vol%. The latter shows a fan-spherulitic texture consisting of skeletal pyroxene and plagioclase crystals with sizes up to 100 µm. Vesicles can reach sizes of ~400 µm. Many lithic clasts are surrounded by a thin dark layer of a more fine-grained crystallized melt. Most pyroxene fragments show shock-deformed exsolution lamellae. Accessories are silica polymorph, ilmenite, Cr-spinel, and troilite.

Geochemistry: Mineral compositions and geochemistry: Lithic clasts: Low-Ca pyroxene Fs_59.8±2.0Wo_3.5±1.4(Fs_56.1-62.8Wo_1.8-6.2); mean Fe/Mn (at.): 33; n=14. Ca-pyroxene Fs_26.7±0.4Wo_43.2±0.4(Fs_25.9-27.3Wo_42.7-44.1; n=12). Plagioclase An_88.9±1.1Or_0.4±0.3(An_87.9-90.6Or_0-0.8); n=8.

Data from:
  MB107
  Table 0
  Line 0:

Place of purchase:	Guelmim, Morocco
Date:	P 2018 Aug
Mass (g):	526
Pieces:	8
Class:	Eucrite-melt breccia
Shock stage:	moderate
Weathering grade:	low
Ferrosilite (mol%):	59.8; 26.7
Wollastonite (mol%):	3.5; 43.2
Classifier:	K. Metzler, IfP
Type spec mass (g):	20
Type spec location:	IfP, Münster
Main mass:	Nourddine Azelmat, Morocco
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. 107, MAPS 55, 460-462

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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9116 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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