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Northwest Africa 6971
Basic information Name: Northwest Africa 6971
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 6971
Observed fall: No
Year found: 2011
Country: (Northwest Africa)
Mass:help 62 g
Classification
  history:
Recommended:  Eucrite-mmict    [explanation]

This is 1 of 212 approved meteorites classified as Eucrite-mmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 10 Mar 2019
Writeuphelp
Writeup from MB 108:

Northwest Africa 6971 (NWA 6971)

(Northwest Africa)

Purchased: 2011

Classification: HED achondrite (Eucrite, monomict)

History: The meteorite was purchased in 2011 from a local meteorite dealer in Erfoud, Morocco.

Physical characteristics: Greyish individual partly covered with fusion crust.

Petrography: Coarse-grained basaltic breccia composed of up to 1.5 mm sized exsolved pyroxenes and calcic plagioclase. Minor phases include FeS, chromite, and silica. No metallic iron was found. Plagioclase is partly converted into maskelynite and the meteorite contains impact melt veins.

Geochemistry: low-Ca pyroxene: Fs50.8±1.2Wo4.0±1.6 (Fs48.9-53.2Wo1.2-6.0, n=14, FeO/MnO=25-28); Ca-pyroxene: Fs25.9±1.6Wo38.8±1.6 (Fs22.4-29.0Wo36.3-42.9, n=19, FeO/MnO=22-30); calcic plagioclase: An93.1±0.7 (An91.9-94.0, n=15)

Data from:
  MB108
  Table 0
  Line 0:
Place of purchase:Erfoud, Morocco
Date:P 2011
Mass (g):62
Pieces:1
Class:Eucrite-mmict
Shock stage:high
Weathering grade:moderate
Ferrosilite (mol%):50.8; 25.9
Wollastonite (mol%):4.0; 38.8
Classifier:A. Greshake, MNB
Type spec mass (g):12.8
Type spec location:MNB
Main mass:Stefan Ralew
Comments:Submitted by Ansgar Greshake
Institutions
   and collections
MNB: Museum für Naturkunde, Invalidenstrasse 43, D-10115 Berlin, Germany (institutional address)
Ralew: Stefan Ralew, Kunibertstraße 29, 12524 Berlin, Germany; Website (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 108, in preparation (2019)
Find references in NASA ADS:
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Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Andreas Grünemeyer   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6741 approved meteorites from (Northwest Africa) (plus 2032 unapproved names)

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