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Northwest Africa 12669
Basic information Name: Northwest Africa 12669
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12669
Observed fall: No
Year found: 2018
Country: (Northwest Africa)
Mass:help 568 g
Classification
  history:
Recommended:  Eucrite    [explanation]

This is 1 of 424 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 12669 (NWA 12669)

(Northwest Africa)

Purchased: 2018

Classification: HED achondrite (Eucrite)

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

Physical characteristics: Three grayish rocks with patches of fusion crust.

Petrography: The meteorite displays a grayish to light-greenish interior and is a breccia composed of up to 3 cm sized basaltic and impact melt clasts set into a fine-grained clastic matrix. Mineral phases are predominantly pyroxene with fine exsolution lamellae and calcic plagioclase with average grain sizes of about 80 μm. Minor phases include silica, ilmenite, chromite, troilite, and zircon. No metallic iron was detected.

Geochemistry: low-Ca pyroxene: Fs52.4±1.2Wo4.7±1.4 (Fs49.7-53.9Wo3.2-6.4, n=15, FeO/MnO=29-36); Ca-pyroxene: Fs28.0±0.6Wo39.7±0.5 (Fs27.3-29.6Wo38.2-40.7, n=13, FeO/MnO=28-33); calcic plagioclase: An87.9±7.7 (An70.2-94.5, n=17)

Data from:
  MB108
  Table 0
  Line 0:
Place of purchase:Laayoune, Morocco
Date:P 2018
Mass (g):568
Pieces:3
Class:Eucrite
Shock stage:low
Weathering grade:low
Ferrosilite (mol%):52.4; 28.0
Wollastonite (mol%):4.7; 39.7
Classifier:A. Greshake, MNB
Type spec mass (g):22.3
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:
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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6781 approved meteorites from (Northwest Africa) (plus 2061 unapproved names)

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