header
  MetSoc Home            Publications            Contacts  
Search the Meteoritical Bulletin Database
Last update: 23 Jan 2021
Search for: Search type: Search limits: Display: Publication:
Names
Text help
Places
Classes
Years
Contains
Starts with
Exact
Sounds like
NonAntarctic
Falls  Non-NWAs
What's new
  in the last:
Include past classifications in search
Limit to approved meteorite names
Search text:  
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:help 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 350 approved meteorites classified as Eucrite-pmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Writeuphelp
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, An70.3 – 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)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7552 approved meteorites from (Northwest Africa) (plus 1969 unapproved names)

Direct link to this page