Meteoritical Bulletin: Entry for Northwest Africa 12686

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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: 600 g

Classification
history:

Meteoritical Bulletin:	MB 108	(2020)	Eucrite
Recommended:			Eucrite [explanation]

This is 1 of 587 approved meteorites (plus 1 unapproved name) classified as Eucrite. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Comments:

Approved 27 Jun 2019

Writeup

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: Fs_62.9±1.0Wo_4.3±1.2(Fs_61.2-64.2Wo_2.8-6.0, n=12, FeO/MnO=27-30); Ca-pyroxene: Fs_33.2±3.0Wo_38.6±3.3(Fs_29.8-37.5Wo_33.6-42.3, n=10, FeO/MnO=29-35); calcic plagioclase: An_79.6±4.1(An_72.2-84.2, 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; updated 24 Dec 2011)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150

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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9305 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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