Meteoritical Bulletin: Entry for Northwest Africa 4301

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Northwest Africa 4301

Basic information

Name: Northwest Africa 4301
This is an OFFICIAL meteorite name.
Abbreviation: NWA 4301
Observed fall: No
Year found: 2006
Country: (Northwest Africa)
Mass: 685 g

Classification
history:

Meteoritical Bulletin:	MB 91	(2007)	Enst achon-ung
Recommended:			Enst achon-ung [explanation]

This is 1 of 5 approved meteorites classified as Enst achon-ung. [show all]
Search for other: Achondrites, Enstatite achondrites, Enstatite-rich meteorites, and Ungrouped achondrites

Comments:

Approved 11 Jun 2006

Writeup

help

Writeup from MB 91:

Northwest Africa 4301

Mauritania or Algeria

Find: April 2006

Enstatite achondrite (ungrouped)

History: Purchased in April 2006 by G. Hupé from a Moroccan dealer in Rabat.

Physical characteristics: A single 685 g stone with some reddish external weathering.

Petrography: (A. Irving and S. Kuehner, UWS)

Subequigranular igneous cumulate texture with relatively coarse-grained (0.2–0.8 mm) silicate, metal, and sulfide grains. Composed mainly of polysynthetically twinned pure enstatite = 70 vol% and kamacite = 15 vol%, with subordinate interstitial plagioclase = 10 vol% and troilite = 5 vol%. Micrometer-size blades and blebs of kamacite and rare daubreelite also occur as inclusions within enstatite.

Mineral composition: Plagioclase (An_30.7–37.6Or_1.8–1.3).

Classification: Enstatite achondrite (ungrouped). Terrestrial weathering has produced some limonite along grain boundaries. This specimen is very similar in texture and mineral compositions to Zakłodzie.

Type specimen: A total of 22.9 g, one polished thin section and one polished mount, are on deposit at UWS. G. Hupé holds the main mass.

Data from:
  MB91
  Table 2
  Line 282:

Place of purchase:	Rabat, Morocco
Date:	2006 Apr
Mass (g):	685
Pieces:	1
Class:	Aung
Weathering grade:	moderate
Classifier:	A. Irving and S. Kuehner, UWS
Type spec mass (g):	22.9
Type spec location:	UWS
Main mass:	G. Hupé

Institutions
and collections

UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 91, MAPS 42, 413-466 (2007)

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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9368 approved meteorites from (Northwest Africa) (plus 1875 unapproved names)

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