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Northwest Africa 4283
Basic information Name: Northwest Africa 4283
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 4283
Observed fall: No
Year found: 2005
Country: (Northwest Africa)
Mass:help 254 g
Classification
  history:
Meteoritical Bulletin:  MB 91  (2007)  Diogenite
Recommended:  Diogenite    [explanation]

This is 1 of 481 approved meteorites classified as Diogenite.   [show all]
Search for other: Achondrites, Diogenites, and HED achondrites
Comments: Approved 28 Mar 2007
Writeuphelp
Writeup from MB 91:

Northwest Africa 4283

Algeria

Find: 2005

Achondrite (diogenite)

History: The stone was found in the southern desert of Algeria and sold in Erfoud, Morocco, in December 2005. Physical characteristics: A light blue-gray stone, with a mass of 254 g, no remnant fusion crust, and a highly irregular outer surface.

Petrography: (J. Wittke and T. Bunch, NAU) Contains orthopyroxene crystals up to 2.7 cm in longest dimension. Large euhedral chromite crystals (~1–3 mm) extend outward from the surface. In addition to the large chromite crystals, orthopyroxene contains stringers of tiny subhedral chromites together with FeS grains and rare metal that is mantled by light Fe oxide staining. The stone is mostly orthopyroxene (96.2 vol%) with chromite, FeS, and metal (3.8 vol%).

Mineral compositions and geochemistry: Orthopyroxene (Fs23.4Wo2.4; FeO/MnO = 26), chromite (cr# = 85), metal (Ni = 0.46 wt%).

Classification: Achondrite (diogenite); minimal shock and weathering.

Type specimen: A total of 28 g and one thin section are on deposit at NAU. Thompson is the main mass holder.

Data from:
  MB91
  Table 2
  Line 276:
Place of purchase:Rissani, Morocco
Date:2005
Mass (g):254
Pieces:1
Class:Dio
Ferrosilite (mol%):23.4
Classifier:T. Bunch and J. Wittke, NAU
Type spec mass (g):28
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 8037 approved meteorites from (Northwest Africa) (plus 1947 unapproved names)

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