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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:help 224 g
Classification
  history:
Meteoritical Bulletin:  MB 100  (2012)  Howardite
Recommended:  Howardite    [explanation]

This is 1 of 372 approved meteorites classified as Howardite.   [show all]
Search for other: Achondrites, HED achondrites, and Howardites
Comments: Approved 3 Oct 2011
Writeuphelp
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 Fs26.5-38Wo2.2-4.2 (FeO/MnO=28-38); plagioclase An96.8; chromite Cr#=75-78. Eucrite pigeonite Fs59.3-65.2Wo6.7-12.5; plagioclase, An87.2-90.6.

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)
Find references in NASA ADS:
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Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 1394 approved meteorites from Morocco (plus 16 unapproved names) (plus 1 impact crater)

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