Meteoritical Bulletin: Entry for Northwest Africa 8540

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Northwest Africa 8540

Basic information

Name: Northwest Africa 8540
This is an OFFICIAL meteorite name.
Abbreviation: NWA 8540
Observed fall: No
Year found: 2013
Country: (Northwest Africa)
Mass: 325 g

Classification
history:

Meteoritical Bulletin:	MB 103	(2014)	LL4
Recommended:			LL4 [explanation]

This is 1 of 396 approved meteorites classified as LL4. [show all]
Search for other: LL chondrites, LL chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)

Comments:

Approved 20 Sep 2014

Writeup

Writeup from MB 103:

Northwest Africa 8540 (NWA 8540)

(Northwest Africa)

Purchased: 2013

Classification: Ordinary chondrite (LL4)

History: Purchased by Sean Tutorow and Walter Trentadue from a Moroccan dealer in 2013.

Physical characteristics: Single stone, weathered exterior; saw cut reveals chondrules and scattered fine-grained metal/sulfide set in a dark gray groundmass.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows PO and BO chondrules and plagioclase grains <2 μm, FeNi metal, Fe-oxide, troilite, and chromite throughout.

Geochemistry: (C. Agee and N. Muttik, UNM) Olivine Fa_29.0±0.4, Fe/Mn=57±2, n=26; low-Ca pyroxene Fs_23.6±2.3Wo_1.6±0.5, Fe/Mn=40±11, n=13.

Classification: Ordinary chondrite (LL4), weathering grade W2.

Specimens: 21.5 g including a probe mount on deposit at UNM. W. Trentadue holds 159.1 g; S. Tutorow holds 127.3 g.

Data from:
  MB103
  Table 0
  Line 0:

Place of purchase:	Morocco
Date:	P 2013
Mass (g):	324.5
Pieces:	1
Class:	LL4
Shock stage:	S3
Weathering grade:	W2
Fayalite (mol%):	29.0±0.4
Ferrosilite (mol%):	23.6±2.3
Wollastonite (mol%):	1.6±0.5
Classifier:	C. Agee, UNM
Type spec mass (g):	21.5
Type spec location:	UNM
Main mass:	Walter Trentadue
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. 103, MAPS 52, 1014, May 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12888/full

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Photos:

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

Geography:

Coordinates:

Unknown.

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

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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