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Northwest Africa 2979
Basic information Name: Northwest Africa 2979
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 2979
Observed fall: No
Year found: 2005
Country: (Northwest Africa)
Mass:help 23.2 g
Meteoritical Bulletin:  MB 91  (2007)  LL/L-imp melt
Recommended:  L/LL-melt rock    [explanation]

This is the only approved meteorite classified as L/LL-melt rock.
Search for other: L chondrites, L/LL chondrites, L/LL chondrites (type 4-7), LL chondrites, Melted chondrites, Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 1 Sep 2006
Writeup from MB 91:

Northwest Africa 2979


Find: 2005

Ordinary chondrite (LL/L impact melt rock)

History and physical characteristics: A completely crusted and very fresh 23.2 g stone was purchased in Erfoud, Morocco, in November 2005.

Petrography: (T. Bunch and J. Wittke, NAU) Small (<0.5 mm) euhedral to subhedral olivine crystals are set in a mesostasis of dark glass, skeletal augite, and tiny (<0.03 mm) spheres of Ni, Fe-rich metal and sulfides. Submillimeter clusters of fine-grained, subhedral olivine with scarce mesostasis are scattered throughout.

Mineral compositions and geochemistry: Mean composition of unzoned olivine (Fa26.8±13.7; FeO/MnO = 36–54, Cr2O3 = 0.35–0.78 wt%), augite (Fs39.4Wo25.8), quartzofeldspathic glass phase that contains FeO = 4.6, MgO =1.75, Cr2O3 = 0.39 (all wt%), chromite (Cr/(Cr+Al) = 0.83), kamacite (Ni = 5.3 wt%), taenite (Ni = 20.1 wt%). Oxygen isotopes: (D. Rumble, CIW) Replicate analyses by laser fluorination technique are δ17O = 3.61, 3.64, δ18O = 4.66, 4.69, Δ17O = 1.164, 1.178 (all ‰).

Classification: Ordinary chondrite (impact melt rock with a LL/L composition).

Type specimen: A 4.8 g specimen is on deposit at NAU*. MFarmer and Strope hold the main mass.

Data from:
  Table 0
  Line 0:
Classifier:T. Bunch and J. Wittke, NAU
Type spec location:NAU* type specimen now at YPMNH. 4.8 g including one polished thin section at YPMNH; remainder with owner.
Comments:Work name 829, thin section RTO3
Data from:
  Table 2
  Line 142:
Place of purchase:Erfoud, Morocco
Mass (g):23.2
Class:L/LL (IMP)
Weathering grade:minimal
Fayalite (mol%):26.8 ± 13.7
Classifier:T. Bunch and J. Wittke, NAU
Type spec mass (g):4.8
Type spec location:NAU*
Main mass:MFarmer and Strope
Plots: O isotopes:  
   and collections
NAU*: Collection discontinued. Specimens redistributed as shown in individual meteorite records, United States (institutional address; updated 24 Jun 2024)
CIW: Carnegie Insitution Washington, Geophysical Laboratory, 5251 Broad Branch Rd., NW, Washington DC 20015, United States (institutional address)
MFarmer: Michael Farmer, P.O. Box 86059, Tucson, AZ 85754-6059, United States; Website (private address)
Strope: 421 Fourth Street, Glen Dale, WV 26038, United States; Website (private address)
YPMNH: Yale University Peabody Museum of Natural History P.O. Box 208118 New Haven, CT 06520-8118 , United States; Website (institutional address; updated 30 Aug 2014)
NAU: Geology, Bldg 12 Knoles Dr Northern Arizona University, Flagstaff, AZ 86011, United States (institutional address; updated 12 Apr 2012)
References: Published in Meteoritical Bulletin, no. 91, MAPS 42, 413-466 (2007)
Published in Meteoritical Bulletin, no. 113, in preparation (2024)
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     This is 1 of 9790 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

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