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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:help 325 g
Classification
  history:
Meteoritical Bulletin:  MB 103  (2014)  LL4
Recommended:  LL4    [explanation]

This is 1 of 389 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
Writeuphelp
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 Fa29.0±0.4, Fe/Mn=57±2, n=26; low-Ca pyroxene Fs23.6±2.3Wo1.6±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:
CreditPhotos
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 9116 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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