Meteoritical Bulletin: Entry for Northwest Africa 2979

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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: 23.2 g

Classification
history:

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

help

Writeup from MB 91:

Northwest Africa 2979

Algeria

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 (Fa_26.8±13.7; FeO/MnO = 36–54, Cr₂O₃ = 0.35–0.78 wt%), augite (Fs_39.4Wo_25.8), 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:
  MB91
  Table 2
  Line 142:

Place of purchase:	Erfoud, Morocco
Date:	2005
Mass (g):	23.2
Pieces:	1
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:

Institutions
and collections

NAU: Geology, Bldg 12 Knoles Dr Northern Arizona University, Flagstaff, AZ 86011, United States; Website (institutional address; updated 12 Apr 2012)
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)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 91, MAPS 42, 413-466 (2007)

Find references in NASA ADS:
Find references in Google Scholar:

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9429 approved meteorites from (Northwest Africa) (plus 1876 unapproved names)

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