Meteoritical Bulletin: Entry for Northwest Africa 2998

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Northwest Africa 2998

Basic information

Name: Northwest Africa 2998
This is an OFFICIAL meteorite name.
Abbreviation: NWA 2998
Observed fall: No
Year found: 2006
Country: (Northwest Africa)
Mass: 163 g

Classification
history:

Meteoritical Bulletin:	MB 91	(2007)	Lunar (anorthositic breccia)
Recommended:			Lunar [explanation]

This is 1 of 106 approved meteorites classified as Lunar. [show all]
Search for other: Lunar meteorites

Comments:

Approved 28 Mar 2007

Writeup

help

Writeup from MB 91:

Northwest Africa 2998

Algeria

Find: 2006

Achondrite (lunar, anorthositic breccia)

History: Found in the southern Algerian desert in May 2006. Purchased by A. Aaronson in Morocco, June 2006.

Physical characteristics: Medium brown, oriented, nearly complete 163 g stone. The fusion crust is fresh, with very prominent flow lines.

Petrography: (T. Bunch and J. Wittke, NAU) Breccia-in-breccia structure; breccia clasts are granulated or cataclastized with fine-grained to melt matrix. Vesiculated shock-melt veins and isolated glass clumps are common. Consists of partially maskelynitized plagioclase fragments (47 vol%), shock-melt anorthositic clasts (38 vol%), dark glasses (7 vol%), norites and troctolites (6 vol%), and olivine and pyroxene fragments (2 vol%). No mare components were observed.

Mineral compositions and geochemistry: Plagioclase (An_93.6–99; FeO = 0.15–0.35 wt%), olivine (Fa_21.7–34.6; FeO/ MnO = 79–87), orthopyroxene (Fs_22.5–29.5Wo_2.1–3.2; FeO/MnO = 53–59), pigeonite (Fs_49.3Wo_5.2; FeO/MnO = 53), augite exsolution lamellae in pigeonite (Fs_27.4Wo_43.1), ferroaugite (Fs_45.8Wo_38.9; FeO/MnO = 28). Bulk composition: (R. Korotev, WUSL, INAA of 224 mg sample) FeO = 2.7 wt%; Ni =60, Sm = 0.42, and Th = 0.13 (all ppm).

Classification: Achondrite (lunar, anorthositic breccia).

Type specimen: A total of 20.4 g and one thin section are on deposit at NAU. The main mass holder is anonymous.

Data from:
  MB91
  Table 2
  Line 147:

Place of purchase:	Erfoud, Morocco
Date:	2006
Mass (g):	163
Pieces:	1
Class:	Lunar
Weathering grade:	minimal
Classifier:	T. Bunch and J. Wittke, NAU
Type spec mass (g):	20.4
Type spec location:	NAU
Main mass:	anonymous

Institutions
and collections

NAU: Geology, Bldg 12 Knoles Dr Northern Arizona University, Flagstaff, AZ 86011, United States; Website (institutional address; updated 12 Apr 2012)
WUSL: Washington Univ., One Brookings Drive, St. Louis, MO 63130, United States (institutional address; updated 17 Oct 2011)
Aaronson: Sahara Overland Ltd., Harhora, Temara, 12000, Morocco (private address; updated 3 Jan 2010)

Catalogs:

References:

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

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Photos:

Credit	Photos
Photos from the Encyclopedia of Meteorites:
unknown

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9699 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

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Revision
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