Meteoritical Bulletin: Entry for Northwest Africa 8197

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Northwest Africa 8197

Basic information

Name: Northwest Africa 8197
This is an OFFICIAL meteorite name.
Abbreviation: NWA 8197
Observed fall: No
Year found: 2013
Country: (Northwest Africa)
Mass: 57 g

Classification
history:

Meteoritical Bulletin:	MB 103	(2014)	Eucrite
Recommended:			Eucrite [explanation]

This is 1 of 569 approved meteorites (plus 1 unapproved name) classified as Eucrite. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Comments:

Approved 22 Feb 2014

Writeup

Writeup from MB 103:

Northwest Africa 8197 (NWA 8197)

(Northwest Africa)

Purchased: 04/2013

Classification: HED achondrite (Eucrite)

Physical characteristics: The meteorite is partly covered by fusion crust and shows a light grey to sandy interior.

Petrography: It shows a fine-grained texture with pyroxene and plagioclase being the dominant phases. Their grain size ranges from 10-100 μm and many pyroxenes show fine exsolution lamellae. Accessories include SiO₂ polymorphs, ilmenite, and chromite.

Geochemistry: Low-Ca pyroxene Fs_58.8-59.5Wo_1.8-2.6, FeO/MnO=31-34; augite Fs_24.8-26.3Wo_43.3-45.1, FeO/MnO=28-36; plagioclase An_85.1-89.2

Data from:
  MB103
  Table 0
  Line 0:

Place of purchase:	Morocco
Date:	P 04/2013
Mass (g):	57
Pieces:	1
Class:	Eucrite
Shock stage:	low
Weathering grade:	low
Ferrosilite (mol%):	58.8-59.5, 24.8-26.3
Wollastonite (mol%):	1.8-2.6, 43.3-45.1
Classifier:	A. Greshake, MNB
Type spec mass (g):	12.1
Type spec location:	MNB
Main mass:	Jürgen Nauber (JNMC)
Comments:	Submitted by Ansgar Greshake

Institutions
and collections

MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011)
JNMC: jnmczurich, P.O. Box 208, CH-8155 Niederhasli, Switzerland; Website (private address; updated 4 Feb 2014)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 103, MAPS 52, 1014, May 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12888/full

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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 8904 approved meteorites from (Northwest Africa) (plus 1871 unapproved names)

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