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Northwest Africa 6983
Basic information Name: Northwest Africa 6983
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 6983
Observed fall: No
Year found: 2011
Country: (Northwest Africa)
Mass:help 503 g
Classification
  history:
Meteoritical Bulletin:  MB 105  (2016)  Eucrite-br
Recommended:  Eucrite-br    [explanation]

This is 1 of 179 approved meteorites classified as Eucrite-br.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 24 Sep 2016
Writeuphelp
Writeup from MB 105:

Northwest Africa 6983 (NWA 6983)

(Northwest Africa)

Purchased: 2011

Classification: HED achondrite (Eucrite, brecciated)

History: The meteorite was bought in 2011 from a local meteorite dealer in Morocco.

Physical characteristics: The two grayish individuals are partly covered by fusion crust.

Petrography: The meteorite is a lithic breccia composed of basaltic, gabbroic, melt and mineral clasts up to 5 mm in size embedded in a fine-grained clastic matrix. Basaltic clasts show coarse- and fine-grained textures and melt clasts are almost opaque. Dominant minerals in clasts and groundmass are calcic plagioclase and exsolved pyroxene. Minor phases include pyrrhotite, troilite, silica, zircon and chromite.

Geochemistry: low-Ca pyroxene: Fs43.5±0.6Wo2.5±0.9 (Fs42.5-44.3Wo1.3-4.1, n=17, FeO/MnO=27-32); Ca-pyroxene: Fs23.6±7.0Wo34.6±10.9 (Fs15.3-32.0Wo21.2-50.6, n=13, FeO/MnO=24-28); calcic plagioclase: An87.3±4.4 (An79.9-92.6, n=14)

Data from:
  MB105
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2011
Mass (g):503
Pieces:2
Class:Eucrite-br
Shock stage:low
Weathering grade:low
Ferrosilite (mol%):43.5; 23.6
Wollastonite (mol%):2.5; 34.6
Classifier:A. Greshake, MNB
Type spec mass (g):20
Type spec location:MNB
Main mass:David Göttlich
Comments:Submitted by Ansgar Greshake
Institutions
   and collections
MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011)
Catalogs:
References: Published in Meteoritical Bulletin, no. 105, MAPS 52, 2411, September 2017. http://onlinelibrary.wiley.com/doi/10.1111/maps.12944/full
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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 7385 approved meteorites from (Northwest Africa) (plus 1955 unapproved names)

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