Meteoritical Bulletin: Entry for Northwest Africa 6974

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Northwest Africa 6974

Basic information

Name: Northwest Africa 6974
This is an OFFICIAL meteorite name.
Abbreviation: NWA 6974
Observed fall: No
Year found: 2011
Country: (Northwest Africa)
Mass: 608 g

Classification
history:

Meteoritical Bulletin:	MB 108	(2020)	Eucrite-br
Recommended:			Eucrite-br [explanation]

This is 1 of 237 approved meteorites classified as Eucrite-br. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Comments:

Approved 10 Mar 2019

Writeup

Writeup from MB 108:

Northwest Africa 6974 (NWA 6974)

(Northwest Africa)

Purchased: 2011

Classification: HED achondrite (Eucrite, brecciated)

History: The meteorite was purchased in 2011 from a local meteorite dealer in Erfoud, Morocco.

Physical characteristics: Four greyish individuals almost completely covered with fusion crust.

Petrography: Fragmental breccia composed of abundant up to 1.5 cm sized basaltic and impact melt clasts set into a fine-grained clastic matrix. Basaltic clasts and matrix are dominantly composed of exsolved pyroxene and often lath-shaped calcic plagioclase grains ranging from 20 to 300 µm. Minor phases include ilmenite, fayalite, silica, FeS, and metallic iron.

Geochemistry: low-Ca pyroxene: Fs_49.4±15.2Wo_2.6±0.9(Fs_22.0-62.4Wo_1.7-5.1, n=30, FeO/MnO=25-33); Ca-pyroxene: Fs_26.2±0.3Wo_44.2±0.2(Fs_25.4-26.5Wo_43.9-44.5, n=8, FeO/MnO=28-31); calcic plagioclase: An_89.9±1.2(An_87.8-91.4, n=15)

Data from:
  MB108
  Table 0
  Line 0:

Place of purchase:	Erfoud, Morocco
Date:	P 2011
Mass (g):	608
Pieces:	4
Class:	Eucrite-br
Shock stage:	low
Weathering grade:	moderate
Ferrosilite (mol%):	49.4; 26.2
Wollastonite (mol%):	2.6; 44.2
Classifier:	A. Greshake, MNB
Type spec mass (g):	20
Type spec location:	MNB
Main mass:	Stefan Ralew
Comments:	Submitted by Ansgar Greshake

Institutions
and collections

MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011)
Ralew: Stefan Ralew, Kunibertstraße 29, 12524 Berlin, Germany; Website (private address)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150

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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9699 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

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Revision
history:

This lists important revisions made to data for this record.

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