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Northwest Africa 12587
Basic information Name: Northwest Africa 12587
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12587
Observed fall: No
Year found: 2014
Country: (Northwest Africa)
Mass:help 71.74 kg
Meteoritical Bulletin:  MB 108  (2020)  Eucrite-mmict
Recommended:  Eucrite-mmict    [explanation]

This is 1 of 261 approved meteorites classified as Eucrite-mmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 11 May 2019
Writeup from MB 108:

Northwest Africa 12587 (NWA 12587)

(Northwest Africa)

Purchased: 2014

Classification: HED achondrite (Eucrite, monomict)

History: Purchased in Denver, September 2014. Reportedly found in northwest Africa.

Physical characteristics: Single mass; saw-cut reveals a mosaic of green pyroxene and white plagioclase grains crosscut by dark-gray shock melt veins.

Petrography: (C. Agee, UNM) This meteorite consists of approximately 50% pyroxene, 30% plagioclase and 20% shock melt. There is a single basaltic eucrite lithology present. The pyroxene is highly equilibrated with a distinct compositional separation between low- and high-Ca pyroxene.

Geochemistry: (C. Agee, UNM) low-Ca pyroxene Fs59.5±1.3Wo3.3±1.5, Fe/Mn=32±1, n=12; high-Ca pyroxene Fs26.8±0.9Wo43.1±1.0, Fe/Mn=32±1, n=9; plagioclase An89.4±2.2, n=7.

Classification: Monomict eucrite

Specimens: 20.11 g on deposit at UNM, MMGM holds the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase:Denver
Date:P 2014
Mass (g):71740
Shock stage:high
Weathering grade:moderate
Ferrosilite (mol%):59.5±1.3, 26.8±0.9
Wollastonite (mol%):3.3±1.5, 43.1±1.0
Classifier:C. Agee, UNM
Type spec mass (g):20.11
Type spec location:UNM
Main mass:MMGM
Comments:Submitted by C. Agee
   and collections
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
MMGM: Maine Mineral and Gem Museum, PO Box 500, 99 Main St., Bethel, ME 04217, United States; Website (institutional address; updated 9 Jan 2020)
References: Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
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     This is 1 of 8495 approved meteorites from (Northwest Africa) (plus 1899 unapproved names)

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