Meteoritical Bulletin: Entry for Northwest Africa 11640

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Northwest Africa 11640

Basic information

Name: Northwest Africa 11640
This is an OFFICIAL meteorite name.
Abbreviation: NWA 11640
Observed fall: No
Year found: 2017
Country: (Northwest Africa)
Mass: 500 g

Classification
history:

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

This is 1 of 660 approved meteorites classified as Ureilite. [show all]
Search for other: Achondrites, Ureilites

Comments:

Approved 20 Feb 2018

Writeup

Writeup from MB 107:

Northwest Africa 11640 (NWA 11640)

(Northwest Africa)

Purchased: 2017

Classification: Ureilite

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

Physical characteristics: Dark brownish fragment lacking any fusion crust.

Petrography: The meteorite shows a cumulate texture of up to 2.5 mm sized olivine and pigeonite grains. Olivine crystals appear to consists of smaller subgrains and pigeonite shows patchy compositional zoning. Olivine displays characterisitic reduced rims. The meteorite contains diamond and shows some foliation.

Geochemistry: reduced rims in olivine: Fa_2.0-7.7; olivine contains 0.65±0.04 wt% Cr₂O₃ and 0.35±0.02 wt% CaO

Data from:
  MB107
  Table 0
  Line 0:

Place of purchase:	Morocco
Date:	P 2017
Mass (g):	500
Pieces:	1
Class:	Ureilite
Shock stage:	low
Weathering grade:	moderate
Fayalite (mol%):	20.9±0.1 (n=14)
Ferrosilite (mol%):	13.4±1.4 (10.8-16.3, n=28)
Wollastonite (mol%):	7.6±3.4 (3.4-14.1, n=28)
Classifier:	A. Greshake, MNB
Type spec mass (g):	20
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. 107, MAPS 55, 460-462

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Photos:

Credit	Photos
Photos uploaded by members of the Encyclopedia of Meteorites. (Caution, these are of unknown reliability)
Robert Smart
Public domain photographs:
Ansgar Greshake

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9710 approved meteorites from (Northwest Africa) (plus 1853 unapproved names)

Also see:

This lists the most popular meteorites among people who looked up this meteorite.

Revision
history:

This lists important revisions made to data for this record.

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