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Northwest Africa 4287
Basic information Name: Northwest Africa 4287
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 4287
Observed fall: No
Year found: 2005
Country: (Northwest Africa)
Mass:help 30 g
Classification
  history:
Meteoritical Bulletin:  MB 91  (2007)  Eucrite-mmict
Recommended:  Eucrite    [explanation]

This is 1 of 598 approved meteorites (plus 1 unapproved name) classified as Eucrite.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 28 Mar 2007
Writeuphelp
Writeup from MB 91:

Northwest Africa 4287

Algeria

Find: 2005

Achondrite (eucrite, monomict breccia)

History: A stone was found in southern Algeria and purchased in Erfoud, Morocco, in November 2005.

Physical characteristics: A 364 g stone partially covered with fusion crust.

Petrography: (J. Wittke and T. Bunch, NAU ) Monomict breccia with subrounded, centimeter-size clasts of subophitic basalt set in a cataclastic matrix. Thin bladed plagioclase up to 5 mm in length encloses granular anhedral pyroxenes, chromite, and ilmenite. Sparse areas of ophitic-textured basalt also occur.

Mineral compositions: Orthopyroxene (Fs59–63.7Wo3.3–4.1; FeO/MnO = 26–40), augite exsolution lamellae (Fs26.1–28.9Wo44.2), plagioclase (An87) and chromite (Cr/(Cr+Al) = 0.83– 0.88).

Classification: Achondrite (eucrite monomict breccia); minimal shock, minimal weathering.

Type specimen: A total of 30 g and one thin section are on deposit at NAU. Thompson holds the main mass.

Data from:
  MB91
  Table 2
  Line 279:
Place of purchase:Erfoud, Morocco
Date:2005
Mass (g):364
Pieces:1
Class:Euc
Shock stage:minimal
Weathering grade:minimal
Ferrosilite (mol%):59-63.7
Classifier:T. Bunch and J. Wittke, NAU
Type spec mass (g):30
Type spec location:NAU
Main mass:Thompson
Institutions
   and collections		 NAU: Geology, Bldg 12 Knoles Dr Northern Arizona University, Flagstaff, AZ 86011, United States; Website (institutional address; updated 12 Apr 2012)
Thompson: Edwin Thompson, 5150 Dawn St., Lake Oswego, OR 97035, United States (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 91, MAPS 42, 413-466 (2007)
Find references in NASA ADS:
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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9699 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)
Also see:
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Revision
  history:
  This lists important revisions made to data for this record.

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