Meteoritical Bulletin: Entry for Northwest Africa 8661

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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: 763 g

Classification
history:

Meteoritical Bulletin:	MB 104	(2015)	Eucrite
Recommended:			Eucrite [explanation]

This is 1 of 571 approved meteorites (plus 1 unapproved name) classified as Eucrite. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Comments:

Approved 18 Feb 2015

Writeup

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 En₆₁Wo₇cores, shows continuous zoning toward Mg-poor and Ca-diverse compositions such as En₆Wo₁₃, En₆Wo_32.Average pyroxene En_37.8±17.6Wo_16.1±8.6, FeO/MnO wt. ratio 29.8±2.7, n=60; plagioclase An_80.5±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 9013 approved meteorites from (Northwest Africa) (plus 1869 unapproved names)

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