Meteoritical Bulletin: Entry for Northwest Africa 6975

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Northwest Africa 6975

Basic information

Name: Northwest Africa 6975
This is an OFFICIAL meteorite name.
Abbreviation: NWA 6975
Observed fall: No
Year found: 2011
Country: (Northwest Africa)
Mass: 226 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 6975 (NWA 6975)

(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: Greyish individual partly covered with fusion crust.

Petrography: Fragmental breccia composed of up to 2 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 500 µm. Minor phases include chromite, ilmenite, silica, and FeS. No metallic iron has been detected.

Geochemistry: low-Ca pyroxene: Fs_59.7±1.3Wo_5.2±1.2(Fs_57.6-63.0Wo_1.8-6.5, n=12, FeO/MnO=26-30); Ca-pyroxene: Fs_29.6±0.8Wo_41.6±0.9(Fs_28.3-31.1Wo_39.6-42.9, n=20, FeO/MnO=25-32); calcic plagioclase: An_89.2±4.8(An_81.8-94.2, n=20)

Data from:
  MB108
  Table 0
  Line 0:

Place of purchase:	Erfoud, Morocco
Date:	P 2011
Mass (g):	226
Pieces:	1
Class:	Eucrite-br
Shock stage:	low
Weathering grade:	moderate
Ferrosilite (mol%):	59.7; 29.6
Wollastonite (mol%):	5.2; 41.6
Classifier:	A. Greshake, MNB
Type spec mass (g):	20.6
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 9710 approved meteorites from (Northwest Africa) (plus 1853 unapproved names)

Also see:

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Revision
history:

This lists important revisions made to data for this record.

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