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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:help 57 g
Classification
  history:
Meteoritical Bulletin:  MB 103  (2014)  Eucrite
Recommended:  Eucrite    [explanation]

This is 1 of 513 approved meteorites (plus 1 unapproved name) classified as Eucrite.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 22 Feb 2014
Writeuphelp
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 Fs58.8-59.5Wo1.8-2.6, FeO/MnO=31-34; augite Fs24.8-26.3Wo43.3-45.1, FeO/MnO=28-36; plagioclase An85.1-89.2

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
Find references in NASA ADS:
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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7885 approved meteorites from (Northwest Africa) (plus 1958 unapproved names)

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