Meteoritical Bulletin: Entry for Northwest Africa 1981

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Northwest Africa 1981

Basic information

Name: Northwest Africa 1981
This is an OFFICIAL meteorite name.
Abbreviation: NWA 1981
Observed fall: No
Year found: 2002
Country: (Northwest Africa)
Mass: 197 g

Classification
history:

Meteoritical Bulletin:	MB 88	(2004)	Eucrite-pmict
MetBase:	v. 7.1	(2006)	Eucrite-pmict
Recommended:			Eucrite-pmict [explanation]

This is 1 of 395 approved meteorites classified as Eucrite-pmict. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Writeup

help

Writeup from MB 88:

Northwest Africa 1981

Morocco

Found 2002

Achondrite (polymict eucrite)

A 197 g complete and crusted stone was purchased in Erfoud, Morocco in 2003. Classification and mineralogy (T. Bunch and J. Wittke, NAU): unique, highly shocked (S5) polymict breccia. Flow orientation of partially granulated clasts; enlongated melt pockets with fine-grain crystallites of plagioclase, pyroxenes, and silica, and minor remnant glass. Pyroxenes: extensive development of planar deformation features and fractures, reduced birefringence, and minor recrystallization. Presence of maskelynite. Eucrite clasts: 82 vol. % are cumulate, 18 % are basaltic. Cumulate pyroxenes: opx mean = Fs₄₉Wo₁₃, Fe/Mn = 27.4 exsolved augite – Fs₁₅Wo ₄₄; pigeonite mean = Fs₄₂ Wo₁₃, Fe/Mn = 29.3; anorthite range, An_{70.3 –
92.8}. Minor ilmenite, sulfides, phosphate, and silica polymorph. Very fresh, no apparent iron staining. Specimens: 21.3 g, NAU; main mass, Boswell.

Data from:
  MB88
  Table 4
  Line 110:

Place of purchase:	Erfoud
Date:	2002
Mass (g):	197
Pieces:	1
Class:	Eucrite
Type spec mass (g):	23

Institutions
and collections

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

Catalogs:

References:

Published in Meteoritical Bulletin, no. 88, MAPS 39, A215-A272 (2004)

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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9111 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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