Meteoritical Bulletin: Entry for Northwest Africa 4473

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Northwest Africa 4473

Basic information

Name: Northwest Africa 4473
This is an OFFICIAL meteorite name.
Abbreviation: NWA 4473
Observed fall: No
Year found: 2006
Country: (Northwest Africa)
Mass: 7.02 kg

Classification
history:

Meteoritical Bulletin:	MB 92	(2007)	Diogenite
Recommended:			Diogenite [explanation]

This is 1 of 522 approved meteorites classified as Diogenite. [show all]
Search for other: Achondrites, Diogenites, and HED achondrites

Comments:

Approved 24 Jul 2007
Revised 30 Aug 2011: Fixed error in mass to agree with text

Writeup

help

Writeup from MB 92:

Northwest Africa 4473

Northwest Africa

Find: July 2006

Achondrite (diogenite)

History: G. Hupé purchased a total of 32 dark stones in July 2006 in Laâyoune, Morocco.

Physical characteristics: Cut-surfaces of the stones show pale yellowish-green angular clasts (see figure) and have a combined weight of 7020 g. No fusion crust was noted for any of the specimens.

Petrography: (A. Irving and S. Kuehner, UWS) Breccia composed of polycrystalline clasts (≤ 2 cm) set in a matrix derived from several different diogenite precursors. No basaltic eucrite clasts were observed. The sample is modally dominated by orthopyroxene with subordinate olivine, augite, chromite, silica polymorph, rare calcic plagioclase, troilite, pyrrhotite and kamacite.

Mineral compositions: Orthopyroxene compositions fall into at least three distinct populations (median compositions): Fs_17.2Wo_1.0, FeO/MnO = 34.4; Fs_21.6Wo_2.1, FeO/MnO = 29.3; Fs_37.2Wo_3.5, FeO/MnO = 32.6). Olivine (Fa_24.5, FeO/MnO = 50.2).

Classification: Achondrite (diogenite).

Specimens: A total of 20.1 g of sample and one polished mount are on deposit at UWS. GHupé holds the main mass.

An image of a handsample of Northwest Africa 4473

Data from:
  MB92
  Table 2
  Line 74:

Place of purchase:	Laayoune, Morocco
Date:	July-2006
Mass (g):	32 [sic]
Pieces:	1
Class:	Dio
Type spec mass (g):	20.1

Institutions
and collections

UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
GHupé: Gregory M. Hupé, 9003 Placid Lakes Blvd., Lake Placid, FL 33852, United States; 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:
The Hupe Collection
Photos uploaded by members of the Encyclopedia of Meteorites. (Caution, these are of unknown reliability)
Denis gourgues
Don Cuarzo
eraserhead
Filip Stalmach
Jim K
John Lutzon
Mark Crawford
Svend Buhl
Photographs from MetBull:
Unknown	A photo is in the write-up above

Geography:

Coordinates:

Unknown.

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

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Revision
history:

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