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Northwest Africa 12686
Basic information Name: Northwest Africa 12686
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12686
Observed fall: No
Year found: 2016
Country: (Northwest Africa)
Mass:help 600 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 12686 (NWA 12686)

(Northwest Africa)

Purchased: 2016

Classification: HED achondrite (Eucrite)

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

Physical characteristics: Single stone partly covered with fusion crust.

Petrography: The meteorite is a polymict breccia with fine-grained basaltic clasts (average mineral grain sizes about 80 μm) set into a coarse-grained basaltic matrix (average mineral grain sizes about 400 μm). Dominant minerals are exsolved pyroxene and calcic plagioclase. Minor phases include silica, ilmenite, chromite, troilite, and metallic iron.

Geochemistry: low-Ca pyroxene: Fs62.9±1.0Wo4.3±1.2 (Fs61.2-64.2Wo2.8-6.0, n=12, FeO/MnO=27-30); Ca-pyroxene: Fs33.2±3.0Wo38.6±3.3 (Fs29.8-37.5Wo33.6-42.3, n=10, FeO/MnO=29-35); calcic plagioclase: An79.6±4.1 (An72.2-84.2, n=15)

Data from:
  MB108
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2016
Mass (g):600
Pieces:1
Class:Eucrite
Shock stage:low
Weathering grade:moderate
Ferrosilite (mol%):62.9; 33.2
Wollastonite (mol%):4.3; 38.6
Classifier:A. Greshake, MNB
Type spec mass (g):22.7
Type spec location:MNB
Main mass:anonymous
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 6781 approved meteorites from (Northwest Africa) (plus 2047 unapproved names)

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