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Northwest Africa 8556
Basic information Name: Northwest Africa 8556
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 8556
Observed fall: No
Year found: 2013
Country: (Northwest Africa)
Mass:help 110 g
Meteoritical Bulletin:  MB 103  (2014)  Eucrite
Recommended:  Eucrite    [explanation]

This is 1 of 569 approved meteorites (plus 1 unapproved name) classified as Eucrite.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 18 Oct 2014
Writeup from MB 103:

Northwest Africa 8556 (NWA 8556)

(Northwest Africa)

Purchased: 2013

Classification: HED achondrite (Eucrite)

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

Physical characteristics: Single stone. Dark irregular weathered exterior. Saw cut reveals a fine grained, light-gray basaltic texture with some shock melt veins.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows pyroxene up to 500 μm, some with fine exsolution lamellae, plagioclase laths, shock melt veins, and calcite weathering veins. Ubiquitous troilite, ilmenite, and silica. Moderate weathering.

Geochemistry: (C. Agee and N. Muttik, UNM) Low-Ca pyroxene Fs57.1±0.8Wo1.8±0.2, Fe/Mn=34±1, n=15; high-Ca pyroxene Fs33.3±13.0Wo32.6±15.1, Fe/Mn=33±2, n=7; plagioclase An83.7±0.7, n=4.

Classification: Achondrite (eucrite)

Specimens: 21.95 g including a probe mount on deposit at UNM, Sean Tutorow holds the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2013
Mass (g):109.97
Weathering grade:moderate
Classifier:C. Agee, UNM
Type spec mass (g):21.95
Type spec location:UNM
Main mass:Sean Tutorow
Comments:Field name G583; submitted by C. Agee, UNM
   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)
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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     This is 1 of 8890 approved meteorites from (Northwest Africa) (plus 1871 unapproved names)

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