Meteoritical Bulletin: Entry for Northwest Africa 13266

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Northwest Africa 13266

Basic information

Name: Northwest Africa 13266
This is an OFFICIAL meteorite name.
Abbreviation: NWA 13266
Observed fall: No
Year found: 2018
Country: (Northwest Africa)
Mass: 750 g

Classification
history:

Recommended:

Enst achon [explanation]

This is 1 of 11 approved meteorites classified as Enst achon. [show all]
Search for other: Achondrites, Enstatite achondrites, and Enstatite-rich meteorites

Comments:

Approved 9 May 2020

Writeup

help

Writeup from MB 109:

Northwest Africa 13266 (NWA 13266)

(Northwest Africa)

Purchased: 2018

Classification: Enstatite achondrite

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

Physical characteristics: Dark brownish rock without fusion crust.

Petrography: The meteorite is an enstatite achondrite predominantly composed of 50-1000 µm sized enstatite and less abundant sodic feldspar grains. Some regions appear to be recrystallized exhibiting triple junctions. Albitic and Si-rich glass is present throughout the meteorite. Opaque phases include nodules composed of niningerite and Cr-rich troilte, Si-rich kamacite, and rare Zn-bearing daubréelite. Metal grains are often spherical. No relict chondrules have been observed.

Geochemistry: enstatite: Fs_0.3±0.2Wo_0.3±1.3(Fs_0.1-0.6Wo_0.2-0.3, n=12); feldspar: An_19.2±1.9Ab_79.1±1.9Or_1.7±0.2(An_81.5-92.3Ab_-75.9-83.2Or_1.4-2.0, n=18); kamacite: Ni=7.04±0.18, Si=2.99±0.01, Co=0.24±0.01, P=0.58±0.39 (wt%), n=3

Classification: Enstatite achondrite.

Data from:
  MB109
  Table 0
  Line 0:

Place of purchase:	Mali
Date:	P 2018
Mass (g):	750
Pieces:	1
Class:	Enst achon
Shock stage:	S1
Weathering grade:	low
Ferrosilite (mol%):	0.3
Wollastonite (mol%):	0.3
Classifier:	A. Greshake, MNB
Type spec mass (g):	21
Type spec location:	MNB
Main mass:	Marcin Cimala
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. 109, in preparation (2020)

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Photos:

Credit	Photos
Public domain photographs:
Ansgar Greshake

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9111 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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