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Northwest Africa 7111
Basic information Name: Northwest Africa 7111
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7111
Observed fall: No
Year found: 2011
Country: (Northwest Africa)
Mass:help 59 g
Classification
  history:
Meteoritical Bulletin:  MB 100  (2012)  Ureilite
Recommended:  Ureilite    [explanation]

This is 1 of 630 approved meteorites classified as Ureilite.   [show all]
Search for other: Achondrites, Ureilites
Comments: Approved 8 Mar 2012
Writeuphelp
Writeup from MB 100:

Northwest Africa 7111 (NWA 7111)

(Northwest Africa)

Purchased: 2011

Classification: Ureilite

History: Purchased by Giorgio Tomelleri at a market in Erfoud, Morocco.

Physical characteristics: Three fragments weighing 59 g, without fusion crust.

Petrography: (V. Moggi Cecchi, G. Pratesi, S. Caporali, MSP) The thin section displays a coarse-grained texture consisting primarily of euhedral olivine grains, with subordinate pyroxene. Olivine grains to 1.6 mm (mean 1.2). Common triple junctions. Individual olivine and pyroxenes grains are rimmed by carbon-rich material. Opaque phases are rare and consisting of kamacite, mainly as traces at grain boundaries.

Geochemistry: Olivine Fa20.7, Cr2O3=0.63 wt%; pigeonite Fs17.2Wo10.1, Cr2O3=1.1 wt%. Oxygen isotopes: (I. Franchi, R. Greenwood, OU) δ17O = 3.303, δ18O = 8.12, Δ17O = -0.9194 per mil.

Classification: Achondrite ureilite (type I).

Specimens: A total of 12.16 g specimen and one thin section is on deposit at MSP (MSP 5186). An anonymous person holds the main mass.

Data from:
  MB100
  Table 1
  Line 1639:
Place of purchase:Erfoud
Date:P 2011
Mass (g):59
Pieces:3
Class:Ureilite
Shock stage:medium
Weathering grade:W2
Fayalite (mol%):20.7
Ferrosilite (mol%):17.2
Wollastonite (mol%):10.1
Classifier:V. Moggi Cecchi, G. Pratesi, S. Caporali, MSP
Type spec mass (g):12.16
Type spec location:MSP
Main mass:Unknown
Finder:unknown
Comments:Inv.# MSP5186; submitted by Vanni Moggi Cecchi
Plots: O isotopes:  
Institutions
   and collections		 MSP: Museo di Scienze Planetarie, Via Galcianese 20/H, 59100 Prato, Italy, Italy; Website (institutional address; updated 22 Oct 2022)
OU: Planetary and Space Sciences Department of Physical Sciences The Open University Walton Hall Milton Keynes MK7 6AA United Kingdom, United Kingdom (institutional address; updated 8 Dec 2011)
Catalogs:
References: Published in Meteoritical Bulletin, no. 100, MAPS 49, E1-E101 (2014)
Find references in NASA ADS:
Find references in Google Scholar:
Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Franco Vignato   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9116 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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