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Northwest Africa 8559
Basic information Name: Northwest Africa 8559
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 8559
Observed fall: No
Year found: 2013
Country: (Northwest Africa)
Mass:help 1759 g
Classification
  history:
Meteoritical Bulletin:  MB 103  (2014)  Howardite
Recommended:  Howardite    [explanation]

This is 1 of 372 approved meteorites classified as Howardite.   [show all]
Search for other: Achondrites, HED achondrites, and Howardites
Comments: Approved 18 Oct 2014
Writeuphelp
Writeup from MB 103:

Northwest Africa 8559 (NWA 8559)

(Northwest Africa)

Purchased: 2013

Classification: HED achondrite (Howardite)

History: Purchased by Brahim Tahiri from a Moroccan hunter and sent to his partner Sean Tutorow for classification, April, 2013.

Physical characteristics: Single stone. Smooth brown weathered exterior. Saw cut reveals breccia with white and dark gray fragmental clasts, also lithic clasts set in a medium-gray groundmass.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows a fragmental to cataclastic breccia with equilibrated (exsolution lamellae) and unequilibrated (igneous zoned) pyroxenes throughout. Silica, troilite, ilmenite, chromite present. Approximately 20% of this meteorite is diogenitic, ~30% is basaltic eucrite, and ~50% is cumulate eucrite.

Geochemistry: (C. Agee and N. Muttik, UNM) Diogenite minerals: low-Ca pyroxene Fs26.4±3.0Wo2.5±1.0, Fe/Mn=28±1, plagioclase An94.6±0.5, n=2. Basaltic eucrite minerals: low-Ca pyroxene Fs58.1±5.0Wo5.9±3.1, Fe/Mn=32±1, n=6; high-Ca pyroxene Fs35.9±9.2Wo34.1±13.1, Fe/Mn=33±2, n=3; plagioclase An85.8, n=1. Cumulate eucrite minerals: low-Ca pyroxene Fs43.6±5.3Wo6.7±3.7, Fe/Mn=32±2, n=9; plagioclase An91.9±0.4, n=2.

Classification: Achondrite (howardite)

Specimens: 20.7 g including a probe mount on deposit at UNM, Sean Tutorow holds the main mass.

Data from:
  MB103
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2013
Mass (g):1758.8
Pieces:1
Class:Howardite
Weathering grade:low
Classifier:C. Agee, UNM
Type spec mass (g):20.7
Type spec location:UNM
Main mass:Sean Tutorow
Comments:Field name G586; submitted by C. Agee, UNM
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
Find references in NASA ADS:
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Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Michael S. Scherman   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6900 approved meteorites from (Northwest Africa) (plus 2035 unapproved names)

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