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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:help 500 g
Classification
  history:
Meteoritical Bulletin:  MB 107  (2018)  Ureilite
Recommended:  Ureilite    [explanation]

This is 1 of 531 approved meteorites classified as Ureilite.   [show all]
Search for other: Achondrites, Ureilites
Comments: Approved 20 Feb 2018
Writeuphelp
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: Fa2.0-7.7; 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
Find references in NASA ADS:
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Photos:
CreditPhotos
Public domain photographs:
Ansgar Greshake      
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7354 approved meteorites from (Northwest Africa) (plus 1958 unapproved names)

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