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Northwest Africa 8713
Basic information Name: Northwest Africa 8713
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 8713
Observed fall: No
Year found: 2014
Country: Morocco
Mass:help 1007 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 11 Apr 2015
Writeuphelp
Writeup from MB 104:

Northwest Africa 8713 (NWA 8713)

Morocco

Purchased: Nov 2014

Classification: HED achondrite (Eucrite, polymict)

Petrography: This sample is brecciated with mineral and lithic fragments set in a fine-grained fragmental matrix. The major minerals are angular pyroxene (70 vol.%, mostly orthopyroxene (Fs38.9±17.4Wo2.4±0.7) and minor pigeonite (Fs50.6±3.1Wo7.7±1.8) with a variation of Fe content and plagioclase (20 vol.%, An88.2-95.1; n=11) ranging from 20-850 μm. A few cumulate eucrite clasts have coarse-grained pyroxene and calcic plagioclase. The presence of large pyroxene grains with relatively uniform composition of Fs23-28Wo1.4-2.3 suggests the presence of a diogenitic composition, but it only accounts for approximately 7 vol.%. A number of hypersthene grains have augite exsolution lamella 1 to 30 μm wide. Melted clasts are present with recrystallized augite, orthopyroxene and interstitial plagioclase. Silica is commonly present. Minor phases include ilmenite, troilite, chromite, and FeNi metal.

Geochemistry: Orthopyroxene (Fs14.9-65.5Wo1.2-3.5), pigeonite (Fs29.1-48.4Wo5.5-8.9), Fe/Mn=25.2-31.8; augite lamella (Fs26.6-31.4Wo40.7-42.4); anorthite (An88.2-95.1).

Data from:
  MB104
  Table 0
  Line 0:
Place of purchase:TanTan
Date:P Nov 2014
Mass (g):1007
Pieces:1
Class:Eucrite-pmict
Ferrosilite (mol%):38.9±17.4 (n=28); 50.6±3.1 (n=4)
Wollastonite (mol%):2.4±0.7 (n=28); 7.7±1.8 (n=4)
Classifier:Wu Y., PMO
Type spec mass (g):30.0
Type spec location:PMO
Main mass:Ke Zuokai
Comments:Submitted by Hsu W.
Institutions
   and collections
PMO: Purple Mountain Observatory, Nanjing, China (institutional address; updated 16 Dec 2011)
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:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 1438 approved meteorites from Morocco (plus 16 unapproved names) (plus 1 impact crater)

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