Meteoritical Bulletin: Entry for Northwest Africa 2988

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Northwest Africa 2988

Basic information

Name: Northwest Africa 2988
This is an OFFICIAL meteorite name.
Abbreviation: NWA 2988
Observed fall: No
Year found: 2006
Country: (Northwest Africa)
Mass: 4.6 kg

Classification
history:

Meteoritical Bulletin:	MB 91	(2007)	Eucrite
Recommended:			Eucrite [explanation]

This is 1 of 588 approved meteorites (plus 1 unapproved name) classified as Eucrite. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Comments:

Approved 28 Mar 2007

Writeup

help

Writeup from MB 91:

Northwest Africa 2988

Algeria

Find: 2006

Achondrite (eucrite)

History: The main mass holders purchased the stone in Erfoud, Morocco, in September 2006.

Physical characteristics: A single, complete stone of 4602 g with partial, moderately weathered fusion crust. Petrography: (T. Bunch and J. Wittke, NAU) Microgranular (pyroxenes < 0.05 mm; plagioclase < 0.1 mm) with rare pyroxene splays and rare megacrysts of plagioclase and pyroxene (up to 0.6 mm in longest dimension). At least two brecciation episodes (breccia-in-breccia) are cross-cut by shock melt injection veins. These melt veins have bulk major and minor elemental compositions consistent with typical eucrite bulk compositions. The stone contains orthopyroxene, augite, plagioclase, chromite, and troilite.

Mineral compositions and geochemistry: Orthopyroxene (Fs₆₁Wo_2.1), augite (Fs_42.3Wo_37.8), chromite (cr# = 81), plagioclase (An_92.3). EMP broad beam analysis of the shock melt glass is: Si = 22.75, Al = 8.7, Ca = 9.45, Ti = 0.45, Cr = 0.2 1, Fe = 12.4, Mg = 3. 1, Mn = 0.3 (all wt%).

Classification: Achondrite (eucrite); S5, minimal weathering.

Type specimens: A total of 20.1 g and one thin section are on deposit at NAU. MFarmer and Strope hold the main mass.

Data from:
  MB91
  Table 2
  Line 144:

Place of purchase:	Erfoud, Morocco
Date:	2006
Mass (g):	4602
Pieces:	1
Class:	Euc
Shock stage:	S5
Weathering grade:	minimal
Ferrosilite (mol%):	61
Classifier:	T. Bunch and J. Wittke, NAU
Type spec mass (g):	20.1
Type spec location:	NAU
Main mass:	MFarmer and Strope

Institutions
and collections

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

Credit	Photos
Photos from the Encyclopedia of Meteorites:
Sergey Vasiliev

Geography:

Coordinates:

Unknown.

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

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