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Northwest Africa 8611
Basic information Name: Northwest Africa 8611
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 8611
Observed fall: No
Year found: 2012
Country: (Northwest Africa)
Mass:help 32.7 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 13 Dec 2014
Writeuphelp
Writeup from MB 103:

Northwest Africa 8611 (NWA 8611)

(Northwest Africa)

Purchased: 23 June 2012

Classification: HED achondrite (Eucrite)

History: Purchased at Sainte-Marie-aux-Mines Mineral Show from a Moroccan mineral dealer

Petrography: This meteorite shows a highly brecciated texture consisting of granular clast (20%), basaltic clast (20%), and fine-grained matrix (60%). All these lithologies display nearly the same modal abundances of minerals, 47% plagioclase, 40% pyroxene (orthopyroxene with augite), and 6% a silica mineral, with chromite, ilmenite and rare troilite. Plagioclase typically shows lath-shaped morphology, and does not show zoning. Pyroxenes do not contain lamellae, and are homogeneous in composition. Some silica grains are identified as cristobalite.

Geochemistry: Plagioclase An88±0.8 (n=30); orthopyroxene, Fs60.8±0.7Wo2.0±0.2 (n=30, FeO/MnO=32.8); augite, Fs26.2±0.7Wo43.5±0.6 (n=10).

Data from:
  MB103
  Table 0
  Line 0:
Place of purchase:Sainte-Marie-aux-Mines
Date:P 23 June 2012
Mass (g):32.7
Pieces:1
Class:Eucrite
Ferrosilite (mol%):60.8±0.7; 26.2±0.7
Wollastonite (mol%):2.0±0.2; 43.5±0.6
Classifier:A. Asahina, T. Noguchi, M. Kimura, Ibaraki
Type spec mass (g):7.3
Type spec location:NMNS
Main mass:Hori Mineraology, Japan
Comments:Field name: HM12-2; submitted by Makoto Kimura
Institutions
   and collections
NMNS: National Museum of Nature and Science, 4-1-1 Amakubo, Tsukuba, Ibaraki 305-0005, JAPAN, Japan; Website (institutional address; updated 16 Jun 2014)
Ibaraki: Department of Materials and Biological Sciences, Institute of Astrophysics and Planetary Science, Ibaraki University, 2-1-1 Bunkyo, Mito 310-8512, Japan (institutional address; updated 27 Feb 2011)
Hori: Unknown person (private address; updated 17 Apr 2009)
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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