Meteoritical Bulletin: Entry for Northwest Africa 6556

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Northwest Africa 6556

Basic information

Name: Northwest Africa 6556
This is an OFFICIAL meteorite name.
Abbreviation: NWA 6556
Observed fall: No
Year found: 2010
Country: Morocco
Mass: 224 g

Classification
history:

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

This is 1 of 451 approved meteorites classified as Howardite. [show all]
Search for other: Achondrites, HED achondrites, and Howardites

Comments:

Approved 3 Oct 2011

Writeup

Writeup from MB 100:

Northwest Africa 6556 (NWA 6556)

Morocco

Found: 2010

Classification: HED achondrite (Howardite)

History: A. Aaronson purchased a 224 g complete stone in Erfoud, Morocco, in 2010.

Physical characteristics: Desert weathered with little remnant fusion crust.

Petrography: Moderately shocked and highly indurated. Clast and mineral modes (vol. %): diogenites 78, eucrites 12, shock melt clasts and shock darkened grains 10. Shock level is S2-S5 with variable shock levels in clasts. Weathering grade is low to moderate.

Geochemistry: Diogenite orthopyroxene Fs_26.5-38Wo_2.2-4.2(FeO/MnO=28-38); plagioclase An_96.8; chromite Cr#=75-78. Eucrite pigeonite Fs_59.3-65.2Wo_6.7-12.5; plagioclase, An_87.2-90.6.

Classification: Achondrite (howardite)

Specimens: 20.2 g is on deposit at NAU, the main mass is held by Aaronson.

Data from:
  MB100
  Table 1
  Line 1417:

Place of purchase:	Erfoud
Date:	2010
Mass (g):	224
Pieces:	1
Class:	Howardite
Shock stage:	S2-5
Weathering grade:	moderate
Ferrosilite (mol%):	26.5-38; 59.3-65.2
Wollastonite (mol%):	2.2-4.2; 8.7-12.5
Classifier:	T. Bunch and Wittke, NAU
Type spec mass (g):	20.2
Type spec location:	NAU
Main mass:	Aaronson
Comments:	Submitted by Bunch

Institutions
and collections

NAU: Geology, Bldg 12 Knoles Dr Northern Arizona University, Flagstaff, AZ 86011, United States; Website (institutional address; updated 12 Apr 2012)
Aaronson: Sahara Overland Ltd., Harhora, Temara, 12000, Morocco (private address; updated 3 Jan 2010)

Catalogs:

References:

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

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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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