Meteoritical Bulletin: Entry for Northwest Africa 6983

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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: 503 g

Classification
history:

Meteoritical Bulletin:	MB 105	(2016)	Eucrite-br
Recommended:			Eucrite-br [explanation]

This is 1 of 187 approved meteorites classified as Eucrite-br. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Comments:

Approved 24 Sep 2016

Writeup

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: Fs_43.5±0.6Wo_2.5±0.9(Fs_42.5-44.3Wo_1.3-4.1, n=17, FeO/MnO=27-32); Ca-pyroxene: Fs_23.6±7.0Wo_34.6±10.9(Fs_15.3-32.0Wo_21.2-50.6, n=13, FeO/MnO=24-28); calcic plagioclase: An_87.3±4.4(An_79.9-92.6, 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:

Credit	Photos
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 7810 approved meteorites from (Northwest Africa) (plus 1971 unapproved names)

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