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Northwest Africa 4869
Basic information Name: Northwest Africa 4869
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 4869
Observed fall: No
Year found: 2006
Country: Algeria
Mass:help 191 g
Classification
  history:
Meteoritical Bulletin:  MB 94  (2008)  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 17 Apr 2008
Writeuphelp
Writeup from MB 94:

Northwest Africa 4869

Algeria

Find: 2006

Achondrite (howardite)

History and physical characteristics: A 191 g dark brown stone with little fusion crust was purchased in Morocco in July 2007 by A. Aaronson.

Petrography: (J. Wittke and T. Bunch, NAU) A complex breccia rich in silica minerals and basaltic eucrites, microbasalts, FeO-rich ferrosilite/hedenbergite/fayalite lithologies, shock melt clasts, and diogenitic pyroxene fragments that comprise 14 vol% of the stone. A silica polymorph is enriched in many of the eucrite lithologies and may account for up to 15 vol% of the gabbroic basalts and as much as 21 vol% of medium to fine-grained basalts. The shock level is high with most plagioclase present as maskelynite. Weathering grade is moderate.

Mineral compositions: Subophitic orthopyroxene host, Fs53Wo4.5 (FeO/MnO = 26); exsolved augite, Fs26.3Wo44; plagioclase (maskelynite), An92. Cumulate unexsolved pigeonite, Fs45.5Wo12.6 and maskelynite, An84. Silica-rich basalt host pyroxene, Fs61.1Wo3.1; lamellae, Fs32.7Wo42; olivine, Fa60.6 (FeO/MnO = 44); maskelynite, An69 Diogenitic pyroxenes, Fs28–34.4Wo1.1–1.4 (FeO/MnO = 29). Minor minerals include chromite, cr# = 78–88, merrillite, Ni-poor metal, ilmenite and FeS.

Classification: Achondrite (howardite).

Type specimen: A total of 20.1 g is on deposit at NAU. Aaronson holds the main mass.

Data from:
  MB94
  Table 2
  Line 77:
State/Prov/County:Erfoud
Date:July 2007
Mass (g):96
Pieces:1
Class:Howardite
Shock stage:moderate
Weathering grade:Low
Classifier:T. Bunch and J. Wittke, NAU
Type spec mass (g):20.1
Type spec location:NAU
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. 94, MAPS 43, 1551-1588 (2008)
Find references in NASA ADS:
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Geography:

Algeria
Coordinates:Unknown.

Statistics:
     This is 1 of 975 approved meteorites from Algeria (plus 26 unapproved names) (plus 4 impact craters)

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