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Northwest Africa 12668
Basic information Name: Northwest Africa 12668
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12668
Observed fall: No
Year found: 2018
Country: (Northwest Africa)
Mass:help 27 g
Classification
  history:
Recommended:  Eucrite    [explanation]

This is 1 of 441 approved meteorites (plus 1 unapproved name) classified as Eucrite.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 27 Jun 2019
Writeuphelp
Writeup from MB 108:

Northwest Africa 12668 (NWA 12668)

(Northwest Africa)

Purchased: 2018

Classification: HED achondrite (Eucrite)

History: The meteorite was purchased from a local meteorite dealer in Laayoune, Mauritania.

Physical characteristics: Dark-grayish rock without fusion crust.

Petrography: The meteorite is a breccia with few basaltic clasts set into a coarse-grained clastic matrix predominantly composed of exsolved pyroxene and calcic plagioclase with average grain sizes of about 400 µm. Minor phases include silica, chromite, FeS, ilmenite, and barite; no metallic Fe has been found. The meteorite contains some shock melt veins.

Geochemistry: low-Ca pyroxene: Fs60.7±0.7Wo2.4±0.5 (Fs58.9-61.8Wo2.1-3.9, n=17, FeO/MnO=29-32); Ca-pyroxene: Fs26.8±1.4Wo43.2±1.5 (Fs25.7-31.0Wo38.3-44.1, n=12, FeO/MnO=30-34); calcic plagioclase: An91.3±0.9 (An89.5-93.1, n=13)

Data from:
  MB108
  Table 0
  Line 0:
Place of purchase:Laayoune, Morocco
Date:P 2018
Mass (g):27
Pieces:1
Class:Eucrite
Shock stage:moderate
Weathering grade:moderate
Ferrosilite (mol%):60.7; 26.8
Wollastonite (mol%):2.4; 43.2
Classifier:A. Greshake, MNB
Type spec mass (g):7.0
Type spec location:MNB
Main mass:Larbi Chnaoui
Comments:Submitted by Ansgar Greshake
Institutions
   and collections
MNB: Museum für Naturkunde, Invalidenstrasse 43, D-10115 Berlin, Germany (institutional address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 108, in preparation (2019)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6968 approved meteorites from (Northwest Africa) (plus 2012 unapproved names)

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