Meteoritical Bulletin: Entry for Northwest Africa 8663

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Northwest Africa 8663

Basic information

Name: Northwest Africa 8663
This is an OFFICIAL meteorite name.
Abbreviation: NWA 8663
Observed fall: No
Year found: 2014
Country: (Northwest Africa)
Mass: 49 g

Classification
history:

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

This is 1 of 408 approved meteorites classified as Eucrite-pmict. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Comments:

Approved 18 Feb 2015

Writeup

Writeup from MB 104:

Northwest Africa 8663 (NWA 8663)

(Northwest Africa)

Purchased: Oct 2014

Classification: HED achondrite (Eucrite, polymict)

Petrography: (P. Warren, UCLA) This eucrite is a fine-grained polymict breccia with a minor (slightly less than 10%, based on the fusion crust composition) diogenite component. Minor Fe-metal.

Geochemistry: Pyroxene ranges from diogenitic (En₆₇Wo₃) to ferroan-eucritic (En₃₈Wo₂). Averages: low-Ca pyroxene En_50.0±13.1Wo_2.5±1.1, FeO/MnO wt ratio 30.5±2.7, n=10; high-Ca pyroxene En_31.4±1.2Wo_42.8±1.0, n=5; plagioclase An_89.5±3.0, n=5. The fusion crust has 18.4 wt% FeO, 9.8 wt% MgO and 11.1 wt.% Al₂O₃, indicating the diogenite component is slightly less than the howardite threshold of 10 w.t%.

Classification: Eucrite (polymict).

Data from:
  MB104
  Table 0
  Line 0:

Place of purchase:	Morocco
Date:	P Oct 2014
Mass (g):	49
Pieces:	15
Class:	Eucrite-pmict
Shock stage:	moderate
Weathering grade:	moderate
Ferrosilite (mol%):	47.5
Wollastonite (mol%):	2.5
Classifier:	P. Warren, UCLA
Type spec mass (g):	10.2
Type spec location:	UCLA
Main mass:	Larry Atkins
Comments:	Submitted by P. Warren

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)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 104, MAPS 52, 2284, Octover 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12930/full

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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9699 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

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Revision
history:

This lists important revisions made to data for this record.

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