Meteoritical Bulletin: Entry for Northwest Africa 11731

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Northwest Africa 11731

Basic information

Name: Northwest Africa 11731
This is an OFFICIAL meteorite name.
Abbreviation: NWA 11731
Observed fall: No
Year found: 2017
Country: (Northwest Africa)
Mass: 500 g

Classification
history:

Meteoritical Bulletin:	MB 107	(2018)	EL6
Recommended:			EL6 [explanation]

This is 1 of 121 approved meteorites classified as EL6. [show all]
Search for other: EL chondrites, Enstatite chondrites, Enstatite chondrites (type 4-7), and Enstatite-rich meteorites

Comments:

Approved 19 Apr 2018

Writeup

Writeup from MB 107:

Northwest Africa 11731 (NWA 11731)

(Northwest Africa)

Purchased: 2017

Classification: Enstatite chondrite (EL6)

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

Physical characteristics: Brownish individual with some patches of black fusion crust.

Petrography: The meteorite displays a recrystallized texture dominated by up to 300 μm sized enstatite grains. Less abundant are albitic feldspar and typically intergrown daubreelite and troilite. No chondrules are visible. The meteorite is strongly altered, i.e., metal is completely converted into Fe-oxides and cracks are frequently filled with calcite and barite.

Geochemistry: feldspar: An_15.8Ab_79.8Or_4.4, n=5

Classification: Although metal is completely oxidized and the Si content could not be determined, the absence of niningerite and alkali sulfides points towards an EL6 classification.

Data from:
  MB107
  Table 0
  Line 0:

Place of purchase:	Morocco
Date:	P 2017
Mass (g):	500
Pieces:	1
Class:	EL6
Shock stage:	S1
Weathering grade:	W4
Ferrosilite (mol%):	0.4±0.1 (n=17)
Wollastonite (mol%):	1.6±0.1 (n=17)
Classifier:	A. Greshake, MNB
Type spec mass (g):	20
Type spec location:	MNB
Main mass:	Philippe Schmitt-Kopplin
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. 107, MAPS 55, 460-462

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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 7579 approved meteorites from (Northwest Africa) (plus 1969 unapproved names)

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