Meteoritical Bulletin: Entry for Northwest Africa 14258

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Northwest Africa 14258

Basic information

Name: Northwest Africa 14258
This is an OFFICIAL meteorite name.
Abbreviation: NWA 14258
Observed fall: No
Year found: 2021
Country: (Northwest Africa)
Mass: 668 g

Classification
history:

Recommended:

Lunar (Feldsp. breccia) [explanation]

This is 1 of 280 approved meteorites classified as Lunar (Feldsp. breccia). [show all]
Search for other: Lunar meteorites

Comments:

Approved 31 Oct 2021

Writeup

help

Writeup from MB 110:

Northwest Africa 14258 (NWA 14258)

(Northwest Africa)

Purchased: 2021 Jun

Classification: Lunar meteorite (feldspathic breccia)

Physical characteristics: A single stone without fusion crust and some caliche on its surface. The interior appears medium gray with small dark and whitish clasts.

Petrography: (K. Metzler, IfP) Fine-grained polymict achondritic breccia, consisting of small lithic clasts (up to 7 mm) and mineral fragments (mainly plagioclase, olivine, and pyroxene) set in a compacted fine-grained clastic matrix of related debris. The clastic matrix is intermingled with small amounts of crystallized vesicular melt. Lithic clast types: fine-grained subophitic basalt, olivine gabbro, fragment-rich impact melt rock, and impact glass. Accessories are ilmenite, chromite, troilite, and Ni-bearing metallic iron (~Fe93Ni7).

Geochemistry: Mineral compositions and geochemistry: Mean olivine composition: Fa_31.9±7.8(Fa_21.4-42.6); Fe/Mn (at.): 96.4±23.4 (62-122); n=10. Mean pyroxene composition Fs_23.1±4.3Wo_4.1±1.2(Fs_18.0-29.9Wo_2.6-6.3); Fe/Mn (at.): 55.0±13.2 (42-75); n=6. Plagioclase An_97.0±0.8(An_95.5-98.1); n=13. Chemistry of an impact glass spherule (wt%): SiO₂=44.3; Al₂O₃=27.4; CaO=16.1; FeO=5.3; MgO=5.1; Na₂O=0.5; TiO₂=0.4; Cr₂O₃=0.2; MnO=0.08.

Classification: Lunar feldspathic breccia

Data from:
  MB110
  Table 0
  Line 0:

Place of purchase:	Nouadhibou, Mauritania
Date:	P 2021 Jun
Mass (g):	668
Pieces:	1
Class:	Lunar (Feldsp. breccia)
Shock stage:	M-S2
Weathering grade:	Low
Fayalite (mol%):	31.9±7.8
Ferrosilite (mol%):	23.1±4.3
Wollastonite (mol%):	4.1±1.2
Classifier:	K. Metzler, IfP
Type spec mass (g):	20
Type spec location:	IfP
Main mass:	Andreas Schefzig
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. 110, in preparation (2021)

Find references in NASA ADS:
Find references in Google Scholar:

Photos:

Credit	Photos
Public domain photographs:
Knut Metzler

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 8559 approved meteorites from (Northwest Africa) (plus 1896 unapproved names)

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