Meteoritical Bulletin: Entry for Northwest Africa 7406

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Northwest Africa 7406

Basic information

Name: Northwest Africa 7406
This is an OFFICIAL meteorite name.
Abbreviation: NWA 7406
Observed fall: No
Year found: 2010
Country: Morocco
Mass: 356 g

Classification
history:

Meteoritical Bulletin:	MB 104	(2015)	EL3
Recommended:			EL3 [explanation]

This is 1 of 27 approved meteorites classified as EL3. [show all]
Search for other: EL chondrites, Enstatite chondrites, Enstatite chondrites (type 3), and Enstatite-rich meteorites

Comments:

Approved 23 Apr 2015

Writeup

Writeup from MB 104:

Northwest Africa 7406 (NWA 7406)

Morocco

Purchased: Dec 2010

Classification: Enstatite chondrite (EL3)

Physical characteristics: A single, complete, desert-varnished stone was found.

Petrography: (A.E. Rubin, UCLA) Chondrules average ~500 μm in apparent diameter which is very close to the 550-μm average chondrule diameter found for EL3 (Rubin, 2010); most are RP and PP types, but there are also rare POP chondrules and chondrule fragments. Many low-Ca pyroxene grains exhibit polysynthetic twins. The rock is so weathered that almost no opaque grains have survived -- only a few grains of troilite and metal. Kamacite: 94.2% Fe, 4.6% Ni, 0.55% Si, 0.30% Co, 0.10% P, 0.09% Cr, 0.07% Mg (n=3). Ti and Mn were below detection limits. Abundant grains of metallic copper <5 μm were observed, usually within matrix enstatite grains.

Bibliography:

Rubin A.E. (2010) Physical properties of chondrules in different chondrite groups: Implications for multiple melting events in dusty environments. Geochim. Cosmochim. Acta 74 4807-4828. (link)

Data from:
  MB104
  Table 0
  Line 0:

Place of purchase:	Purchased from Ali Oulmaleh
Date:	P Dec 2010
Mass (g):	356.3
Pieces:	1
Class:	EL3
Shock stage:	medium
Weathering grade:	high
Fayalite (mol%):	0.1±0.1 (n=4)
Ferrosilite (mol%):	0.6±0.4 (n=15)
Wollastonite (mol%):	2.4±0.6 (n=15)
Classifier:	A. Rubin, UCLA
Type spec mass (g):	29.72
Type spec location:	UCLA
Main mass:	Utas
Finder:	anonymous
Comments:	Submitted by JUtas

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)
JUtas: Jason Utas, United States (private address; updated 8 Jun 2010)

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:

Morocco

Coordinates:

Unknown.

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

Also see:

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Revision
history:

This lists important revisions made to data for this record.

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