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Northwest Africa 8550
Basic information Name: Northwest Africa 8550
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 8550
Observed fall: No
Year found: 2013
Country: (Northwest Africa)
Mass:help 148.6 g
Classification
  history:
Meteoritical Bulletin:  MB 103  (2014)  Eucrite-mmict
Recommended:  Eucrite-mmict    [explanation]

This is 1 of 232 approved meteorites classified as Eucrite-mmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 18 Oct 2014
Writeuphelp
Writeup from MB 103:

Northwest Africa 8550 (NWA 8550)

(Northwest Africa)

Purchased: 2013

Classification: HED achondrite (Eucrite, monomict)

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 weathered fusion crust exterior. Saw cut reveals a breccia with white feldspathic clasts up to 5 mm set in a light-gray matrix.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount reveals a breccia with some shock melt veins, larger mm-sized clasts and also fine-grained cataclastic zones, pyroxenes show exsolution lamellae. Ubiquitous troilite, chromite, ilmenite, and apatite. Low weathering grade.

Geochemistry: (C. Agee and N. Muttik, UNM) Low-Ca pyroxene Fs62.7±1.0Wo2.1±0.8, Fe/Mn=31±1, n=11; high-Ca pyroxene Fs31.2±5.3Wo38.6±6.2, Fe/Mn=31±1, n=11; plagioclase An87.1±2.3, n=8. Melt vein Mg#=38.3±1.0, n=5.

Classification: Achondrite (monomict eucrite)

Specimens: 25.5 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):148.6
Pieces:1
Class:Eucrite-mmict
Weathering grade:low
Ferrosilite (mol%):62.7; 31.2
Wollastonite (mol%):2.1; 38.6
Classifier:C. Agee, UNM
Type spec mass (g):25.5
Type spec location:UNM
Main mass:Sean Tutorow
Comments:Field name G546; 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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Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Denis gourgues   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7187 approved meteorites from (Northwest Africa) (plus 2002 unapproved names)

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