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Northwest Africa 8583
Basic information Name: Northwest Africa 8583
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 8583
Observed fall: No
Year found: 2014
Country: (Northwest Africa)
Mass:help 640 g
Classification
  history:
Meteoritical Bulletin:  MB 104  (2015)  Eucrite-pmict
Recommended:  Eucrite-pmict    [explanation]

This is 1 of 344 approved meteorites classified as Eucrite-pmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 10 Mar 2015
Writeuphelp
Writeup from MB 104:

Northwest Africa 8583 (NWA 8583)

(Northwest Africa)

Purchased: 2014 Jun 25

Classification: HED achondrite (Eucrite, polymict)

History: Purchased from a moroccan meteorite dealer in Sainte-Marie aux Mines

Petrography: (K. Metzler, IfP) Chemically different basaltic and granulitic eucrite clasts and mineral fragments set in a brownish matrix. The matrix represents a crystallized melt, consisting of tiny pyroxene and plagioclase crystals. Plagioclase fragments are polycrystalline, some showing fluidal textures. Small amounts of maskelynite. Most pyroxene fragments show augite exsolution lamellae. Accessories are ilmenite, chromite, silica polymorph and isolated olivine fragments.

Geochemistry: Low-Ca pyroxene: Fs62.0±4.94.2±1.9 (Fs54-68Wo2-9, Fe/Mn=29, n=15). Augite lamellae: Fs29.2±2.9Wo42.9±0.7 (Fs23-32Wo41-44, Fe/Mn=31, n=14). Plagioclase: An89.2±1.9 (An86-92; n=10). Isolated olivine grains: Fa71-83, Fe/Mn=40, n=4.

Classification: Polymict eucrite (clast-rich melt rock)

Data from:
  MB104
  Table 0
  Line 0:
Place of purchase:Sainte-Marie aux Mines
Date:P 2014 Jun 25
Mass (g):640
Pieces:1
Class:Eucrite-pmict
Shock stage:high
Weathering grade:moderate
Fayalite (mol%):71-83
Ferrosilite (mol%):62.0±4.9; 29.2±2.9
Wollastonite (mol%):4.2±1.9; 42.9±0.7
Classifier:K. Metzler, IfP
Type spec mass (g):20g
Type spec location:IfP
Main mass:E. and U. Eger, Bochum, Germany
Comments:Submitted by K. Metzler, IfP
Institutions
   and collections
IfP: Institut für Planetologie, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany (institutional address; updated 23 Jan 2012)
Catalogs:
References: Published in Meteoritical Bulletin, no. 104, MAPS 52, 2284, Octover 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12930/full
Find references in NASA ADS:
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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7101 approved meteorites from (Northwest Africa) (plus 2004 unapproved names)

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