Meteoritical Bulletin: Entry for Northwest Africa 2981

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Northwest Africa 2981

Basic information

Name: Northwest Africa 2981
This is an OFFICIAL meteorite name.
Abbreviation: NWA 2981
Observed fall: No
Year found: 2005
Country: (Northwest Africa)
Mass: 19 g

Classification
history:

Meteoritical Bulletin:	MB 91	(2007)	L-imp melt rock
Recommended:			L-melt rock [explanation]

This is 1 of 47 approved meteorites classified as L-melt rock. [show all]
Search for other: L chondrites, L chondrites (type 4-7), Melted chondrites, Ordinary chondrites, and Ordinary chondrites (type 4-7)

Comments:

Approved 1 Sep 2006

Writeup

help

Writeup from MB 91:

Northwest Africa 2981

Algeria

Find: August 2005

Ordinary chondrite (L impact melt rock)

History and physical characteristics: A 19 g, lightly weathered and partially crusted stone was purchased in Erfoud, Morocco, in August 2005.

Petrography: (J. Wittke and T. Bunch, NAU) Consists of mostly small (<0.5 mm) euhedral to subhedral olivine crystals set in a dark, MgO-, FeO-bearing feldspathic glass together with clusters of fine-grained (<0.1 mm) anhedral olivine with scarce glass are scattered throughout as well as millimeter-size clumps of Ni-Fe metal cores with sulfide rims. Mesostasis glass contains a connected network of skeletal augite and tiny, round to irregular-shaped metal and sulfide grains.

Mineral compositions and geochemistry: Mean compositions are: olivine (Fa_22.6; FeO/MnO = 46), rare orthopyroxene (Fs_19.1±7.1), diopside (Fs₁₂Wo_43.4), pigeonite (Fs_17.4–28.6Wo_12–5.8), kamacite (Ni = 6.8 wt%), glass with SiO₂ = 67, Al₂O₃ =10.2, CaO = 5.7, Na₂O = 2.17, K₂O = 2.13, MgO = 5.9, FeO = 3.0 (all as wt%).

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

Type specimen: A 4.1 g sample is on deposit at NAU. GHupé holds the main mass.
NWA 2981

Cut surface displayed of NWA 2981. Cube is 1 cm³.

A PPL image of a thin section of NWA 2981. Field of view = 9 mm.

Data from:
  MB91
  Table 2
  Line 143:

Place of purchase:	Erfoud, Morocco
Date:	2005
Mass (g):	19
Pieces:	1
Class:	L (IMP)
Weathering grade:	minimal
Fayalite (mol%):	22.6
Ferrosilite (mol%):	19.7 ± 7.1
Classifier:	T. Bunch and J. Wittke, NAU
Type spec mass (g):	4.1
Type spec location:	NAU
Main mass:	G. Hupé

Institutions
and collections

NAU: Geology, Bldg 12 Knoles Dr Northern Arizona University, Flagstaff, AZ 86011, United States; Website (institutional address; updated 12 Apr 2012)
GHupé: Gregory M. Hupé, 9003 Placid Lakes Blvd., Lake Placid, FL 33852, 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:

Credit	Photos
Photos from the Encyclopedia of Meteorites:
The Hupe Collection

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9116 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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