Meteoritical Bulletin: Entry for Northwest Africa 8198

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Northwest Africa 8198

Basic information

Name: Northwest Africa 8198
This is an OFFICIAL meteorite name.
Abbreviation: NWA 8198
Observed fall: No
Year found: 2013
Country: (Northwest Africa)
Mass: 60 g

Classification
history:

Meteoritical Bulletin:	MB 104	(2015)	Eucrite-pmict
Recommended:			Eucrite-pmict [explanation]

This is 1 of 408 approved meteorites classified as Eucrite-pmict. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Comments:

Approved 28 Feb 2015

Writeup

Writeup from MB 104:

Northwest Africa 8198 (NWA 8198)

(Northwest Africa)

Purchased: 04/2013

Classification: HED achondrite (Eucrite, polymict)

Physical characteristics: The single fragment is partly covered with shiny fusion crust and displays a light-grayish interior.

Petrography: It is composed of mineral and lithic clasts including basaltic and melt lithologies set into a more fine-grained clastic matrix. Mineral fragments are large mostly exsolved pyroxenes and calcic plagioclase. Minor phases include chromite, troilite, and SiO₂ polymorphs.

Geochemistry: Low-Ca pyroxene: Fs_57.3±2.1Wo_4.8±2.5(Fs_53.3-59.7Wo_1.7-9.5, n=13, FeO/MnO=30-32); Ca-pyroxene: Fs_26.6±1.1Wo_43.3±1.3(Fs_25-29.4Wo_39.8-44.6, n=13, FeO/MnO=28-33); calcic plagioclase: An_88.8±0.6(An_88-90.5, n=14)

Data from:
  MB104
  Table 0
  Line 0:

Place of purchase:	Morocco
Date:	P 04/2013
Mass (g):	60
Pieces:	1
Class:	Eucrite-pmict
Shock stage:	low
Weathering grade:	low
Ferrosilite (mol%):	59.4-61.2, 27.4-30.1
Wollastonite (mol%):	3.3-6.2, 41-43.3
Classifier:	A. Greshake, MNB
Type spec mass (g):	13.5
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. 104, MAPS 52, 2284, Octover 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12930/full

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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9699 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

Also see:

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Revision
history:

This lists important revisions made to data for this record.

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