Meteoritical Bulletin: Entry for Northwest Africa 7253

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Northwest Africa 7253

Basic information

Name: Northwest Africa 7253
This is an OFFICIAL meteorite name.
Abbreviation: NWA 7253
Observed fall: No
Year found: 2012
Country: Morocco
Mass: 404 g

Classification
history:

Meteoritical Bulletin:	MB 100	(2012)	Eucrite
Recommended:			Eucrite [explanation]

This is 1 of 598 approved meteorites (plus 1 unapproved name) classified as Eucrite. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Comments:

Approved 14 Apr 2012

Writeup

help

Writeup from MB 100:

Northwest Africa 7253 (NWA 7253)

Morocco

Purchased: 2012

Classification: HED achondrite (Eucrite)

History: Purchased by Blaine Reed in Tucson 2012.

Physical characteristics: Many small fragments, some with shiny black fusion crust, light desert coating on exterior. Broken surface shows fresh, fine-grained mix of plagioclase and pyroxene.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows ~55% pyroxene and ~40% plagioclase, with minor silica, chromite and ilmenite. Olivine is ubiquitous in grain boundaries. Some pyroxenes show zoning with Mg-rich cores, twinning absent.

Geochemistry: (C. Agee and M. Spilde, UNM) Unequilibrated basalt with a range of pyroxene compositions consistent with type-2 eucrites (Takeda and Graham, 1991). Low Ca-pyroxene Fs_45.9±13.1Wo_6.5±3.0, Fe/Mn=32±1, n=66, high-Ca pyroxene Fs_37.4±7.6Wo_31.0±8.7, Fe/Mn=32±1, N=23, plagioclase Or_0.6±0.3Ab_10.7±3.7An_88.8±4.0, n=15, olivine Fa_82.0±0.8, Fe/Mn=42±1, n=19.

Classification: Achondrite (Eucrite). Unequilibrated eucrite with pyroxene compositions similar to Pasamonte. Minimal weathering, some fine grained cataclastic brecciation.

Specimens: 24.2 g including a probe mount on deposit at UNM, Reed holds 190 g, Yinan Wang holds 180 g.

Data from:
  MB100
  Table 1
  Line 1696:

Place of purchase:	Tucson
Date:	P 2012
Mass (g):	404
Pieces:	Many
Class:	Eucrite
Fayalite (mol%):	82.0±0.8
Ferrosilite (mol%):	45.9±13.1, 37.4±7.6
Wollastonite (mol%):	6.5±3.0, 31.0±8.7
Classifier:	C. Agee, UNM
Type spec mass (g):	24.2
Type spec location:	UNM
Main mass:	Blaine Reed, Yinan Wang
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)
Reed: Blaine Reed, P.O. Box 1141, Delta, CO 81416, United States; Website (private address)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 100, MAPS 49, E1-E101 (2014)

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Geography:

Morocco

Morocco

Coordinates:

Unknown.

Statistics:
This is 1 of 2082 approved meteorites from Morocco (plus 31 unapproved names) (plus 1 impact crater)

Also see:

This lists the most popular meteorites among people who looked up this meteorite.

Revision
history:

This lists important revisions made to data for this record.

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