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Northwest Africa 8554
Basic information Name: Northwest Africa 8554
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 8554
Observed fall: No
Year found: 2013
Country: (Northwest Africa)
Mass:help 54.4 g
Meteoritical Bulletin:  MB 103  (2014)  Eucrite-mmict
Recommended:  Eucrite-mmict    [explanation]

This is 1 of 272 approved meteorites classified as Eucrite-mmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 18 Oct 2014
Writeup from MB 103:

Northwest Africa 8554 (NWA 8554)

(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. Saw cut reveals a breccia with gray and white fragmental clasts; also cm-size lithic clast set in a light-colored matrix.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount reveals a breccia with some fragmental pyroxene and plagioclase grains, many fine-grained basaltic clasts, pyroxenes lack exsolution lamellae. Ubiquitous Fe-metal, chromite, ilmenite, and silica. Low weathering grade.

Geochemistry: (C. Agee and N. Muttik, UNM) Pigeonite Fs50.6±2.1Wo13.0±2.8, Fe/Mn=32±1, n=25; plagioclase An87.1 ±2.3, n=5.

Classification: Achondrite (monomict eucrite), single, fairly narrow pyroxene (pigeonite) compositional range, no separation into high and low-calcium pyroxenes.

Specimens: 11.4 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):54.38
Weathering grade:low
Ferrosilite (mol%):50.6
Wollastonite (mol%):13.0
Classifier:C. Agee, UNM
Type spec mass (g):11.4
Type spec location:UNM
Main mass:Sean Tutorow
Comments:Field name G564; 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 8904 approved meteorites from (Northwest Africa) (plus 1871 unapproved names)

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