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Northwest Africa 11511
Basic information Name: Northwest Africa 11511
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11511
Observed fall: No
Year found: 2017
Country: Algeria
Mass:help 527 g
Classification
  history:
Recommended:  Lodranite    [explanation]

This is 1 of 75 approved meteorites classified as Lodranite.   [show all]
Search for other: Acapulcoite-lodranite family, Lodranites, and Primitive achondrites
Comments: Approved 12 May 2018
Writeuphelp
Writeup from MB 107:

Northwest Africa 11511 (NWA 11511)

Algeria

Purchased: 2017 Jun

Classification: Primitive achondrite (Lodranite)

History: Purportedly found near Adrar, Algeria, and purchased by Darryl Pitt in June 2017 from a dealer in Mauritania.

Petrography: (A. Irving and S. Kuehner, UWS) Protogranular aggregate composed predominantly of mafic silicates (orthopyroxene with subordinate olivine, grainsize 0.2-0.7 mm) with accessory sodic plagioclase, tabular graphite and rare schreibersite. Both orthopyroxene and olivine have thin reduced, magnesian rims containing minor blebs of Fe metal.

Geochemistry: Orthopyroxene (Fs10.4-10.5Wo4.5-4.4, FeO/MnO = 13; rim Fs1.1Wo0.4, FeO/MnO = 20; N = 3), olivine (Fa12.6-12.7, FeO/MnO = 22-23; rim Fa6.8, FeO/MnO = 10; N = 3).

Classification: Lodranite (orthopyroxene-rich). The presence of graphite, schreibersite and sparse reduced magnesian rims on orthopyroxene and olivine are unusual features. This specimen has some similarities to paired lodranites NWA 8410 and NWA 8422, but differs from those stones in being notably orthopyroxene-rich, lacking Ca-rich pyroxene and containing graphite.

Specimens: 20.3 g including one polished thin section at UWB; remainder with DPitt.

Data from:
  MB107
  Table 0
  Line 0:
Place of purchase:Mauritania
Date:P 2017 Jun
Mass (g):527
Pieces:1
Class:Lodranite
Shock stage:low
Weathering grade:low
Fayalite (mol%):12.6-12.7
Ferrosilite (mol%):10.4-10.5
Wollastonite (mol%):4.5-4.4
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):20.3
Type spec location:UWB
Main mass:DPitt
Comments:Work name MVCH 296; submitted by A. Irving
Institutions
   and collections
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
DPitt: Darryl Pitt, 225 West 83rd Street, New York, NY 10024, United States; Website (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 107, in preparation (2018)
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Photos:
CreditPhotos
Public domain photographs:
A. Irving   
Geography:

Algeria
Coordinates:Unknown.

Statistics:
     This is 1 of 770 approved meteorites from Algeria (plus 26 unapproved names) (plus 4 impact craters)

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