Meteoritical Bulletin: Entry for Northwest Africa 5558

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Northwest Africa 5558

Basic information

Name: Northwest Africa 5558
This is an OFFICIAL meteorite name.
Abbreviation: NWA 5558
Observed fall: No
Year found: 2008
Country: (Northwest Africa)
Mass: 38.6 g

Classification
history:

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

This is 1 of 616 approved meteorites (plus 1 unapproved name) classified as Eucrite. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Comments:

Approved 16 Mar 2016

Writeup

Writeup from MB 105:

Northwest Africa 5558 (NWA 5558)

(Northwest Africa)

Purchased: 2008

Classification: HED achondrite (Eucrite)

History: The meteorite was bought in 2008 on a mineral fair in Ensisheim, France.

Petrography: The meteorite shows a basaltic texture of up to 0.5 mm sized often lath-shaped plagioclase grains and more fine-grained exsolved pyroxene. Minor phases include chromite, pyrrhotite and silica.

Geochemistry: low-Ca pyroxene: Fs_57.9±0.2Wo_6.2±0.1n=16 (Fs_57.5-58.1Wo_6.1-6.5, n=15, FeO/MnO=31-34); Ca-pyroxene: Fs_29.3±0.4Wo_41.3±0.4(Fs_28.7-30Wo_40.6-42, n=16, FeO/MnO=34-38); calcic plagioclase: An_90.1±1.3(An_87.2-91.8, n=18)

Data from:
  MB105
  Table 0
  Line 0:

Origin or pseudonym:	SJS-08025
Place of purchase:	Ensisheim, France
Date:	P 2008
Mass (g):	38.6
Pieces:	1
Class:	Eucrite
Shock stage:	moderate
Weathering grade:	low
Ferrosilite (mol%):	57.9; 29.3
Wollastonite (mol%):	6.2; 41.3
Classifier:	A. Greshake, MNB
Type spec mass (g):	8.1
Type spec location:	MNB
Main mass:	Marc Jost
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)
Solar Anamnesis
Space Jewels

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9921 approved meteorites from (Northwest Africa) (plus 1838 unapproved names)

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