Meteoritical Bulletin: Entry for Northwest Africa 4391

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Northwest Africa 4391

Basic information

Name: Northwest Africa 4391
This is an OFFICIAL meteorite name.
Abbreviation: NWA 4391
Observed fall: No
Year found: 2005
Country: (Northwest Africa)
Mass: 54.8 g

Classification
history:

Meteoritical Bulletin:	MB 92	(2007)	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 24 Jul 2007

Writeup

help

Writeup from MB 92:

Northwest Africa 4391

Northwest Africa

Find: 2005

Achondrite (eucrite, polymict)

History: An anonymous finder recovered the meteorite in northwest Africa.The main mass holder acquired the specimen in 2005 in Midelt, Morocco.

Physical characteristics: A single stone weighing, 54.8 g with a grayish color and little fusion crust present was recovered.

Petrography: (A. Greshake, MNB). The meteorite is a polymict breccia consisting of coarse basaltic and mineral clasts set into an abundant fine-grained groundmass. Mineral fragments are dominantly large plagioclase and exsolved low-Ca pyroxene. Minor phases include silica, ilmenite, and Al,Ti-rich chromite.

Mineral compositions: Plagioclase (An_85.5-95.9) and pyroxene (Fs_41.7-54Wo_2.6-20.1).

Classification: Achondrite (eucrite, polymict); moderate shock, moderate weathering.

Type specimens: A total of 11.4 g of sample plus one polished thin section are on deposit at MNB. Ralew holds the main mass.

Data from:
  MB92
  Table 2
  Line 64:

Place of purchase:	Midelt, Morocco
Date:	2005
Mass (g):	54.8
Pieces:	1
Class:	Euc
Type spec mass (g):	11.4

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. 92, MAPS 42, 1647-1694 (2007)

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Photos:

Credit	Photos
Photos from the Encyclopedia of Meteorites:
Chladni's Heirs

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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