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Northwest Africa 8712
Basic information Name: Northwest Africa 8712
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 8712
Observed fall: No
Year found: 2014
Country: Morocco
Mass:help 455 g
Classification
  history:
Meteoritical Bulletin:  MB 104  (2015)  Howardite
Recommended:  Howardite    [explanation]

This is 1 of 376 approved meteorites classified as Howardite.   [show all]
Search for other: Achondrites, HED achondrites, and Howardites
Comments: Approved 27 Mar 2015
Writeuphelp
Writeup from MB 104:

Northwest Africa 8712 (NWA 8712)

Morocco

Purchased: Feb. 2014

Classification: HED achondrite (Howardite)

Petrography: The thin section shows mineral and lithic clasts (up to 4 mm in the longest dimension) of pigeonite (Fs46.1±5.2Wo10.5±3.3; n=13) and plagioclase set in a matrix of angular pyroxene (mainly orthopyroxene (Fs30.1±9.7Wo2.5±0.7; n=18) and pigeonite with a variation of Fe content) and plagioclase. Plagioclase are bytownite and anorthite. Some pigeonite grains have augite exsolution lamella. Melted clasts are observed with euhedral recrystallized olivine, pyroxene and interstitial plagioclase. Minor phases are troilite, chromite, FeNi metal and SiO2 polymorphs. Eucritic component is approximately 40 vol.%.

Geochemistry: Orthopyroxene (Fs23.6-57.5Wo1.5-3.6), Fe/Mn=28.9-34; pigeonite (Fs35.7-52.4Wo5.5-16.7), Fe/Mn=27.2-32.7; augite lamella (Fs26.8-39.7Wo24.1-34.5); plagioclase (An82.8-95.9, n=12).

Classification: Howardite

Specimens: 20 g at PMO.

Data from:
  MB104
  Table 0
  Line 0:
Place of purchase:Tucson
Date:P Feb. 2014
Mass (g):455
Pieces:1
Class:Howardite
Fayalite (mol%):26.5±7.6 (n=4)
Ferrosilite (mol%):30.1±9.7 (n=18); 46.1±5.2 (n=13)
Wollastonite (mol%):2.5±0.7 (n=18); 10.5±3.3 (n=13)
Classifier:Wu Y.
Type spec mass (g):20
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 1460 approved meteorites from Morocco (plus 21 unapproved names) (plus 1 impact crater)

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