Meteoritical Bulletin: Entry for Northwest Africa 6984

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Northwest Africa 6984

Basic information

Name: Northwest Africa 6984
This is an OFFICIAL meteorite name.
Abbreviation: NWA 6984
Observed fall: No
Year found: 2010
Country: (Northwest Africa)
Mass: 7 g

Classification
history:

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

This is 1 of 252 approved meteorites classified as Eucrite-mmict. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Comments:

Approved 24 Sep 2016

Writeup

Writeup from MB 105:

Northwest Africa 6984 (NWA 6984)

(Northwest Africa)

Purchased: 2010

Classification: HED achondrite (Eucrite, monomict)

History: The meteorite was bought in 2010 from a local meteorite dealer in Morocco.

Physical characteristics: The meteorite displays a sand-coloured interior and is partly covered by fusion crust.

Petrography: The meteorite is a monomict breccia displaying a basaltic texture of up to 1 mm sized exsolved pyroxenes and 1.5 mm sized calcic pagioclase. Minor phases include chromite, silica, pyrrhotite and ilmenite. Shock melt veins are abundant.

Geochemistry: low-Ca pyroxene: Fs_57.7±1.4Wo_3.2±1.7(Fs_55.5-59.1Wo_1.6-5.9, n=7, FeO/MnO=29-32); Ca-pyroxene: Fs_23.7±1.0Wo_43.7±1.0(Fs_24.3-27.3Wo_40.9-44.3, n=14, FeO/MnO=28-31); calcic plagioclase: An_88.3±3.0(An_81.3-91.1, n=15)

Data from:
  MB105
  Table 0
  Line 0:

Place of purchase:	Morocco
Date:	P 2010
Mass (g):	7
Pieces:	1
Class:	Eucrite-mmict
Shock stage:	high
Weathering grade:	low
Ferrosilite (mol%):	57.7; 23.7
Wollastonite (mol%):	3.2; 43.7
Classifier:	A. Greshake, MNB
Type spec mass (g):	1.6
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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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 7820 approved meteorites from (Northwest Africa) (plus 1971 unapproved names)

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