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Northwest Africa 8661
Basic information Name: Northwest Africa 8661
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 8661
Observed fall: No
Year found: 2011
Country: (Northwest Africa)
Mass:help 763 g
Classification
  history:
Meteoritical Bulletin:  MB 104  (2015)  Eucrite
Recommended:  Eucrite    [explanation]

This is 1 of 441 approved meteorites (plus 1 unapproved name) classified as Eucrite.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 18 Feb 2015
Writeuphelp
Writeup from MB 104:

Northwest Africa 8661 (NWA 8661)

(Northwest Africa)

Purchased: June 2011

Classification: HED achondrite (Eucrite)

Petrography: (P. Warren, UCLA) This eucrite shows a typical medium-subophitic texture of an unbrecciated noncumulate eucrite, except pyroxene shows no perciptible exsolution. Minor Fe-metal.

Geochemistry: Pyroxene, starting from En61Wo7 cores, shows continuous zoning toward Mg-poor and Ca-diverse compositions such as En6Wo13, En6Wo32. Average pyroxene En37.8±17.6Wo16.1±8.6, FeO/MnO wt. ratio 29.8±2.7, n=60; plagioclase An80.5±2.7, n=45. Oxygen isotopes: (I. Kohl and E. Young, UCLA) δ17O 1.868, δ18O 3.914, Δ17O -0.209 (all normalized). EPMA, in wt.%, derived from a 0.28 g powder) SiO2 49.5, TiO2 1.28, Al2O3 11.5, Cr2O3 0.24, MgO 5.5, FeO 18.2, MnO 0.51; mg# 0.349.

Classification: Eucrite (unbrecciated). Low thermal metamorphism.

Data from:
  MB104
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P June 2011
Mass (g):763
Pieces:1
Class:Eucrite
Shock stage:moderate
Weathering grade:low
Ferrosilite (mol%):44.6
Wollastonite (mol%):16.1
Classifier:P. Warren, UCLA
Type spec mass (g):22.5
Type spec location:UCLA
Main mass:A. Hmani
Comments:Submitted by P. Warren
Plots: O isotopes:  
Institutions
   and collections
UCLA: Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA 90095-1567, United States (institutional address; updated 17 Oct 2011)
Hmani: A. Hmani Moroccan Imports, 13 rue Jules Hardouin Mansart, 92600 Asnières, France (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 104, MAPS 52, 2284, Octover 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12930/full
Find references in NASA ADS:
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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6968 approved meteorites from (Northwest Africa) (plus 2012 unapproved names)

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