Meteoritical Bulletin: Entry for Northwest Africa 4557

MetSoc Home Publications Contacts

Search the Meteoritical Bulletin Database
Last update: 1 Apr 2023
Search for:	Search type:	Search limits:	Display:	Publication:
Names Text Places Classes Years	Contains Starts with Exact Sounds like	NonAntarctic Falls Non-NWAs Has strewnfield		What's new in the last:
Include past classifications in search		Has photo	Limit to approved meteorite names
Search text:

Northwest Africa 4557

Basic information

Name: Northwest Africa 4557
This is an OFFICIAL meteorite name.
Abbreviation: NWA 4557
Observed fall: No
Year found: 2006
Country: (Northwest Africa)
Mass: 250 g

Classification
history:

Meteoritical Bulletin:	MB 92	(2007)	L4
Recommended:			L4 [explanation]

This is 1 of 2009 approved meteorites (plus 4 unapproved names) classified as L4. [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)

Comments:

Approved 24 Jul 2007

Data from:
  MB92
  Table 2
  Line 101:

Place of purchase:	Erfoud, Morocco
Date:	2006
Mass (g):	250
Pieces:	1
Class:	L4
Shock stage:	S3-5
Weathering grade:	W1
Fayalite (mol%):	23
Ferrosilite (mol%):	19.8
Wollastonite (mol%):	2.4
Classifier:	T. Bunch, NAU
Type spec mass (g):	18.7
Type spec location:	NAU
Main mass:	Cimala
Comments:	Shock darkened

Institutions
and collections

NAU: Geology, Bldg 12 Knoles Dr Northern Arizona University, Flagstaff, AZ 86011, United States; Website (institutional address; updated 12 Apr 2012)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 92, MAPS 42, 1647-1694 (2007)

Find references in NASA ADS:
Find references in Google Scholar:

Photos:

Credit	Photos
Photos from the Encyclopedia of Meteorites:
Polandmet

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9042 approved meteorites from (Northwest Africa) (plus 1870 unapproved names)

Direct link to this page