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Northwest Africa 8551
Basic information Name: Northwest Africa 8551
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 8551
Observed fall: No
Year found: 2013
Country: (Northwest Africa)
Mass:help 135.6 g
Classification
  history:
Meteoritical Bulletin:  MB 103  (2014)  Ureilite
Recommended:  Ureilite    [explanation]

This is 1 of 516 approved meteorites classified as Ureilite.   [show all]
Search for other: Achondrites, Ureilites
Comments: Approved 18 Oct 2014
Writeuphelp
Writeup from MB 103:

Northwest Africa 8551 (NWA 8551)

(Northwest Africa)

Purchased: 2013

Classification: Ureilite

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

Physical characteristics: Single stone. Irregular dark exterior.  Saw cut reveals fresh-appearing mosaic of light gray and dark gray crystals, grain size 1-2 mm.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows texturally equilibrated olivines and pyroxenes, most with triple junctions. Olivine and pyroxene grains have Fe-depleted rims. Grain boundaries are occupied by graphite, Fe-metal, Fe-oxide, and diamond.

Geochemistry: (C. Agee and N. Muttik, UNM) Olivine Fa18.6±4.5, Fe/Mn=39±11, Cr2O3=0.75±0.09 (wt%), n=12; Fs15.3±3.4Wo10.3±0.3, Fe/Mn=23±6, Cr2O3=1.11±0.05 (wt%), n=12.

Classification: Achondrite (ureilite)

Specimens: 20.2 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):135.6
Pieces:1
Class:Ureilite
Weathering grade:low
Fayalite (mol%):18.6
Ferrosilite (mol%):15.3
Wollastonite (mol%):10.3
Classifier:C. Agee, UNM
Type spec mass (g):20.2
Type spec location:UNM
Main mass:Sean Tutorow
Comments:Field name G560; 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
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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7035 approved meteorites from (Northwest Africa) (plus 2000 unapproved names)

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