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Northwest Africa 6887
Basic information Name: Northwest Africa 6887
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 6887
Observed fall: No
Year found: 2011
Country: Morocco
Mass:help 120 g
Classification
  history:
Meteoritical Bulletin:  MB 100  (2012)  Eucrite
Recommended:  Eucrite    [explanation]

This is 1 of 443 approved meteorites (plus 1 unapproved name) classified as Eucrite.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 1 Aug 2011
Writeuphelp
Writeup from MB 100:

Northwest Africa 6887 (NWA 6887)

Morocco

Found: 2011

Classification: HED achondrite (Eucrite)

History: Purchased by Jay Piatek in 2011.

Physical characteristics: Single stone of 120 g, complete shiny fusion crust. Interior shows uniform, light gray, fine grain matrix.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows low-Ca pyroxene, high-Ca pyroxene (total pyroxene about 60%) and plagioclase feldspar (35%), with ubiquitous ilmenite and troilite, no Fe-Ni metal detected. Pyroxene with exsolution lamellae. Grain size ranges from 10-300 μm. Some areas with plumose intergrowths of plagioclase and pyroxene.

Geochemistry: (C. Agee and M. Spilde, UNM) EMPA. Equilibrated eucrite. Low-Ca pyroxene Fs60.7±1.2Wo2.8±1.0 Fe/Mn=33±1, N=8, augite Fs26.6±0.9Wo44.0±0.9 Fe/Mn=32±2, N=8, plagioclase Or0.5±0.1Ab9.7±1.4An89.9±1.5, N=13.

Classification: Achondrite (eucrite); minimal weathering, low shock grade.

Specimens: 20 g and probe mount on deposit at UNM. Piatek holds the main mass.

Data from:
  MB100
  Table 1
  Line 1525:
Place of purchase:Morocco
Date:2011
Mass (g):120
Pieces:1
Class:Eucrite
Ferrosilite (mol%):60.7±1.2; 26.6±0.9
Wollastonite (mol%):2.8±1.0; 44.0±0.9
Classifier:C. Agee, UNM
Type spec mass (g):20
Type spec location:UNM
Main mass:Piatek
Comments:Submitted by C. Agee
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. 100, MAPS 49, E1-E101 (2014)
Find references in NASA ADS:
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Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 1417 approved meteorites from Morocco (plus 15 unapproved names) (plus 1 impact crater)

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