Meteoritical Bulletin: Entry for Northwest Africa 7485

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Northwest Africa 7485

Basic information

Name: Northwest Africa 7485
This is an OFFICIAL meteorite name.
Abbreviation: NWA 7485
Observed fall: No
Year found: 2012
Country: Morocco
Mass: 360 g

Classification
history:

Meteoritical Bulletin:	MB 101	(2012)	Eucrite-mmict
Recommended:			Eucrite-mmict [explanation]

This is 1 of 281 approved meteorites classified as Eucrite-mmict. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Comments:

Approved 8 Nov 2012

Writeup

help

Writeup from MB 101:

Northwest Africa 7485 (NWA 7485)

Morocco

Purchased: May 2012

Classification: HED achondrite (Eucrite, monomict)

History: Purchased by Sean Tutorow in May 2012 from a Moroccan meteorite dealer.

Physical characteristics: Single stone, dark brown exterior, some weathered fusion crust, saw cut reveals patches of dark-gray and light-gray, slight oxidation.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows a brecciated texture with approximately 60% pyroxene and 30% plagioclase, many pyroxenes with exsolution lamellae. Numerous shock melt veins up to 500 μm wide. Accessory silica, ilmenite, chromite, troilite, and low-Ni iron metal.

Geochemistry: (C. Agee and M. Spilde, UNM) Pyroxene Fs_47.5±14.6Wo_19.1±17.6, Fe/Mn=31±1, n=36, with equilibrated trend Fs_61.0Wo_1.8to Fs_27.0Wo_43.2; plagioclase Or_0.5±0.4Ab_10.3±1.6An_89.2±2.0, n=7.

Classification: Achondrite (eucrite, monomict). Equilibrated main group eucrite.

Specimens: 20.41 g including a probe mount on deposit at UNM, Sean Tutorow holds the main mass.

Data from:
  MB101
  Table 0
  Line 0:

Place of purchase:	Morocco
Date:	P May 2012
Mass (g):	360.12
Pieces:	1
Class:	Eucrite-mmict
Ferrosilite (mol%):	47.5±14.6
Wollastonite (mol%):	19.1±17.6
Classifier:	C. Agee, UNM
Type spec mass (g):	20.4
Type spec location:	UNM
Main mass:	Sean Tutorow
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)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 101, MAPS 50, 1661, September 2015

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Photos:

Credit	Photos
Photos uploaded by members of the Encyclopedia of Meteorites. (Caution, these are of unknown reliability)
Mike Markowitz

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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