Meteoritical Bulletin: Entry for Northwest Africa 6970

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Northwest Africa 6970

Basic information

Name: Northwest Africa 6970
This is an OFFICIAL meteorite name.
Abbreviation: NWA 6970
Observed fall: No
Year found: 2011
Country: (Northwest Africa)
Mass: 15 g

Classification
history:

Meteoritical Bulletin:	MB 111	(2023)	Eucrite-pmict
Recommended:			Eucrite-pmict [explanation]

This is 1 of 408 approved meteorites classified as Eucrite-pmict. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Comments:

Approved 19 Feb 2022

Writeup

help

Writeup from MB 111:

Northwest Africa 6970 (NWA 6970)

(Northwest Africa)

Purchased: 2011

Classification: HED achondrite (Eucrite, polymict)

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

Physical characteristics: Grayish rock almost completely covered with fusion crust.

Petrography: The meteorite is a polymict breccia composed of a variety of mineral and lithic fragments set into a fine-grained clastic groundmass. Lithic fragments are up to 4 mm sized basaltic and impact melt clasts. Predominant minerals are exsolved pyroxene, homogeneous pigeonite, zoned pigeonite, zoned orthopyroxene, and calcic plagioclase all with highly variable grain sizes up to 700 µm. Minor phases include silica, Ti-poor chromite, ilmenite, FeS, and metallic iron.

Geochemistry: low-Ca pyroxene host to exsolution lamellae: Fs_53.1±0.1Wo_2.1±0.1(Fs_52.9-53.3Wo_2.0-2.5, FeO/MnO=30-32, n=7); augite exsolution lamellae: Fs_27.0±0.6Wo_39.0±0.7(Fs_26.1-28.1Wo_37.2-39.4, FeO/MnO=27-33, n=8); homogeneous pigeonite: Fs_41.3±0.2Wo_8.5±0.3(Fs_40.9-41.7Wo_8.0-8.9, FeO/MnO=25-29, n=9); zoned pigeonite: Fs_43.6±4.2Wo_7.6±1.6(Fs_38.2-48.4Wo_5.1-10.0, FeO/MnO=27-33, n=6); zoned low-Ca-pyroxene: Fs_41.6±11.8Wo_2.6±0.2(Fs_25.1-54.7Wo_2.4-2.9, FeO/MnO=29-37, n=7); calcic plagioclase: An_86.9±2.2(An_83.6-89.8, n=7)

Data from:
  MB111
  Table 0
  Line 0:

Place of purchase:	Erfoud, Morocco
Date:	P 2011
Mass (g):	15
Pieces:	1
Class:	Eucrite-pmict
Shock stage:	low
Weathering grade:	low
Ferrosilite (mol%):	53.1; 27.0; 41.3; 43.6; 41.6
Wollastonite (mol%):	2.1; 39.0; 8.5; 7.6; 2.6
Classifier:	A. Greshake, MNB
Type spec mass (g):	3.3
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 Gattacceca J., McCubbin F. M., Grossman J. N., Schrader D. L., Chabot N. L., D’Orazio M., Goodrich C., Greshake A., Gross J., Joy K. H., Komatsu M. and Miao B. (2023) The Meteoritical Bulletin, No. 111. Meteoritics & Planetary Science 58, 901–904. ?

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Photos:

Credit	Photos
Photos uploaded by members of the Encyclopedia of Meteorites. (Caution, these are of unknown reliability)
Andreas Grünemeyer

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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