Meteoritical Bulletin: Entry for Northwest Africa 7477

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Northwest Africa 7477

Basic information

Name: Northwest Africa 7477
This is an OFFICIAL meteorite name.
Abbreviation: NWA 7477
Observed fall: No
Year found: 2012
Country: Morocco
Mass: 616 g

Classification
history:

Meteoritical Bulletin:	MB 101	(2012)	L3.9
Recommended:			L3.9 [explanation]

This is 1 of 29 approved meteorites classified as L3.9. [show all]
Search for other: L chondrites, L chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)

Comments:

Approved 23 Oct 2012

Writeup

Writeup from MB 101:

Northwest Africa 7477 (NWA 7477)

Morocco

Purchased: May 2012

Classification: Ordinary chondrite (L3.9)

History: Purchased by Sean Tutorow in Morocco, May 2012.

Physical characteristics: One stone, saw cut reveals dark matrix, fine-grained metal and veining, and chondrules.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows numerous PO, POP, and BO chondrules with mesostasis. Scattered, fine-grained, oxidized kamacite and iron-oxide weathering veins throughout. Accessory augite and pentlandite, no plagioclase present.

Geochemistry: (C. Agee and M. Spilde, UNM) Olivine Fa_24.0±2.6, Fe/Mn=49±7, n=21; low-Ca pyroxene Fs_18.4±4.8Wo_1.0±0.3, Fe/Mn=31±18, n=14.

Classification: Ordinary chondrite (L3.9), weathering grade W3.

Specimens: 23.39 g including a probe mount on deposit at UNM, Sean Tutorow holds the main mass.

Data from:
  MB101
  Table 0
  Line 0:

Place of purchase:	Morocco
Date:	P May 2012
Mass (g):	616.18
Pieces:	1
Class:	L3.9
Weathering grade:	W3
Fayalite (mol%):	24.0±2.6
Ferrosilite (mol%):	18.4±4.8
Wollastonite (mol%):	1.0±0.3
Classifier:	C. Agee, UNM
Type spec mass (g):	23.39
Type spec location:	UNM
Main mass:	Sean Tutorow
Comments:	Submitted by C. Agee

Institutions
and collections

UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 101, MAPS 50, 1661, September 2015

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Photos:

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

Geography:

Morocco

Coordinates:

Unknown.

Statistics:
This is 1 of 2082 approved meteorites from Morocco (plus 31 unapproved names) (plus 1 impact crater)

Also see:

This lists the most popular meteorites among people who looked up this meteorite.

Revision
history:

This lists important revisions made to data for this record.

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