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Northwest Africa 12290
Basic information Name: Northwest Africa 12290
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12290
Observed fall: No
Year found: 2018
Country: (Northwest Africa)
Mass:help 60 g
Classification
  history:
Meteoritical Bulletin:  MB 107  (2018)  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 11 Dec 2018
Writeuphelp
Writeup from MB 107:

Northwest Africa 12290 (NWA 12290)

(Northwest Africa)

Purchased: 2018

Classification: HED achondrite (Eucrite)

History: The meteorite was purchased from a local meteorite dealer in Layaoune, Morocco.

Physical characteristics: Brownish individual without fusion crust.

Petrography: The meteorite is an unbrecciated medium-grained basalt predominantly composed of exsolved pyroxene and mostly lath-shaped calcic plagioclase with average grains sizes of about 400 μm. Minor phases include silica, ilmenite, chromite, troilite, barite, and zircon. No metallic iron has been detected. The meteorite is strongly shock metamorphosed and crosscut by several shock melt veins. All plagioclase has been transformed into maskelynite.

Geochemistry: low-Ca pyroxene: Fs60.3±0.7Wo2.6±0.8 (Fs58.2-61.1Wo2.1-5.3, n=16, FeO/MnO=31-35); Ca-pyroxene: Fs26.3±1.0Wo42.9±1.3 (Fs25.2-29.4Wo39.1-44.1, n=14, FeO/MnO=28-37); calcic plagioclase: An89.3±1.0 (An88.1-90.7, n=14)

Data from:
  MB107
  Table 0
  Line 0:
Place of purchase:Layaoune, Morocco
Date:P 2018
Mass (g):60
Pieces:1
Class:Eucrite
Shock stage:strong
Weathering grade:moderate
Ferrosilite (mol%):60.3; 26.3
Wollastonite (mol%):2.6; 42.9
Classifier:A. Greshake, MNB
Type spec mass (g):12.1
Type spec location:MNB
Main mass:Hichame Mimaghado
Comments:Submitted by Ansgar Greshake
Institutions
   and collections		 MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011)
Catalogs:
References: Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462
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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