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Northwest Africa 2791
Basic information Name: Northwest Africa 2791
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 2791
Observed fall: No
Year found: 2004
Country: (Northwest Africa)
Mass:help 383 g
Classification
  history:
Meteoritical Bulletin:  MB 91  (2007)  LL3-4
Recommended:  LL3-4    [explanation]

This is 1 of 2 approved meteorites classified as LL3-4.   [show all]
Search for other: LL chondrites, LL chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 28 Mar 2007
Writeuphelp
Writeup from MB 91:

Northwest Africa 2791

Algeria

Find: 2004

Ordinary chondrite (LL3-4)

History: This partial stone was found in 2004 and purchased in Erfoud, Morocco, in May 2005.

Physical characteristics: The 383 g stone is partially covered with a black, lightly weathered fusion crust.

Petrography: (T. Bunch and J. Wittke, NAU) A polymict breccia that represents many different lithologies. These include LL3.6 and LL4 chondrites, an unknown carbonaceous chondrite, shock-melted clasts and several of unknown petrologic lineage set in a matrix of plentiful chondrules and fragmental material.

Mineral compositions and geochemistry: LL3.6 chondrite clasts: olivine (Fa23–34; FeO/MnO = 50–55, Cr2O3 = 0.0– 0.12 wt%). LL4 chondrite clasts: olivine (Fa30; FeO/MnO = 55–60). Carbonaceous chondrite clasts: olivine (Fa43.7–54.4; FeO/MnO = 82–93), orthopyroxene (Fs33–41.5Wo1.3–2.0), spinel (fe# = 72), FeS (Cr = 0.82 wt%).

Classification: LL3-4 (polymict breccia); S2-5, W2.

Type specimen: A total of 23.4 g and one thin section are on deposit at NAU. TWebb holds the main mass.

Data from:
  MB91
  Table 2
  Line 115:
Place of purchase:Erfoud, Morocco
Date:2004
Mass (g):383
Pieces:1
Class:LL3-4
Shock stage:S2
Weathering grade:W2
Classifier:T. Bunch and J. Wittke, NAU
Type spec mass (g):23
Type spec location:NAU
Main mass:TWebb
Institutions
   and collections
NAU: Geology, Bldg 12 Knoles Dr Northern Arizona University, Flagstaff, AZ 86011, United States; Website (institutional address; updated 12 Apr 2012)
TWebb: No contact information provided., 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 6900 approved meteorites from (Northwest Africa) (plus 2035 unapproved names)

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