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Northwest Africa 2968
Basic information Name: Northwest Africa 2968
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 2968
Observed fall: No
Year found: 2005
Country: (Northwest Africa)
Mass:help 268 g
Classification
  history:
Meteoritical Bulletin:  MB 91  (2007)  Achondrite-ung
Recommended:  Achondrite-ung    [explanation]

This is 1 of 84 approved meteorites classified as Achondrite-ung.   [show all]
Search for other: Achondrites, Ungrouped achondrites
Comments: Approved 1 Sep 2006
Writeuphelp
Writeup from MB 91:

Northwest Africa 2968

Northwest Africa

Find: 2004

Achondrite (ungrouped)

History and physical characteristics: A bag of rectangular to blocky, dark brown meteorite fragments, with a total mass of 268 g and collected by nomads in 2004, was purchased in Erfoud, Morocco, in November 2005.

Petrography: (T. Bunch and J. Wittke, NAU; A. Irving, UWS) A massive olivine-rich rock of very large grain size (17 to >25 mm; maximum size is unknown because of the tendency to fracture on cutting). Curved to linear compression and shear fractures are subparallel to one of the extinction directions in olivine and are responsible for the common rectangular/blocky habit. Twenty-three pieces (1.8 to 20.1 g) were surveyed. Olivine accounts for >95 vol% with small amounts of tiny grains (<0.03 mm) of orthopyroxene, metal, troilite, and pyrrhotite commonly found within fractures and as rare inclusions in olivine. Large domain offset, isolated mosaicism, and undulatory extinction are prevalent in olivine.

Mineral compositions and geochemistry: Equilibrated olivine (Fa7.5±0.2; FeO/MnO = 48; Cr2O3 and NiO < 0.03 wt%), orthopyroxene (Fs6.7Wo1.5; FeO/MnO = 26), kamacite (Ni = 4.7–6.8 wt%), taenite (Ni = 39.1–50.7 wt%), troilite (Ni = 0.36 wt%), pyrrhotite (Ni = 1.7–4.7 wt%). Oxygen isotopes: (D. Rumble, CIW) Analysis of two cleaned and metal-free samples by laser fluorination yielded δ17O = 1.44, 1.46; δ18O = 3.08, 3.64 and Δ17O = −0.178, −0.212 (all ‰).

Classification: Achondrite (ungrouped).

Type specimen: A 22 g sample is on deposit at NAU. Reed holds the main mass.

Data from:
  MB91
  Table 2
  Line 136:
Place of purchase:Erfoud, Morocco
Date:2005
Mass (g):268
Pieces:Many
Class:Aung
Fayalite (mol%):7.5 ± 0.2
Ferrosilite (mol%):6.7
Wollastonite (mol%):1.5
Classifier:T. Bunch and J. Wittke, NAU
Type spec mass (g):22
Type spec location:NAU
Main mass:Reed
Plots: O isotopes:  
Institutions
   and collections
NAU: Geology, Bldg 12 Knoles Dr Northern Arizona University, Flagstaff, AZ 86011, United States; Website (institutional address; updated 12 Apr 2012)
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
CIW: Carnegie Insitution Washington, Geophysical Laboratory, 5251 Broad Branch Rd., NW, Washington DC 20015, United States (institutional address)
Reed: Blaine Reed, P.O. Box 1141, Delta, CO 81416, United States; Website (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 91, MAPS 42, 413-466 (2007)
Find references in NASA ADS:
Find references in Google Scholar:
Photos:
CreditPhotos
Photos from the Encyclopedia of Meteorites:
Collection FABIEN/FRANÇOIS-XAVIER KUNTZ/FLOTTERER      
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Argus Rocks   
Fabien Kuntz      
Gerald Armstrong   
Nuno Chaves   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6781 approved meteorites from (Northwest Africa) (plus 2061 unapproved names)

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