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Northwest Africa 11807
Basic information Name: Northwest Africa 11807
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11807
Observed fall: No
Year found: 2018
Country: (Northwest Africa)
Mass:help 172.5 g
Classification
  history:
Recommended:  Winonaite    [explanation]

This is 1 of 32 approved meteorites classified as Winonaite.   [show all]
Search for other: Primitive achondrites, Winonaites
Comments: Approved 28 May 2018
Revised 13 Aug 2018: reclassified based on O
Writeuphelp
Writeup from MB 107:

Northwest Africa 11807 (NWA 11807)

(Northwest Africa)

Purchased: 2018 Jan

Classification: Primitive achondrite (Winonaite)

History: Purchased by Darryl Pitt in January 2018 from a Moroccan dealer at the Tucson Gem and Mineral Show.

Petrography: (A. Irving and S. Kuehner, UWS) Metamorphic aggregate (mean grainsize 320 µm, with triple grain junctions) composed of forsterite, diopside and enstatite with accessory troilite and stained kamacite.

Geochemistry: Olivine (Fa2.9-3.0, FeO/MnO = 12-13, N = 3), orthopyroxene (Fs2.7-3.0Wo1.1-1.0, FeO/MnO = 8, N = 2), clinopyroxene (Fs1.1-1.2Wo46.4-46.3, FeO/MnO = 5, N = 2). Oxygen isotopes (K. Ziegler, UNM): analyses of acid-washed subsamples by laser fluorination gave, respectively, δ17O 2.395, 2.477, 2.360; δ18O 5.567, 5.758, 5.487; Δ17O -0.544, -0.563, -0.537 per mil.

Classification: Winonaite.

Specimens: 20.2 g including one polished thin section at UWB; remainder with DPitt.

Data from:
  MB107
  Table 0
  Line 0:
Place of purchase:Tucson
Date:P 2018 Jan
Mass (g):172.5
Pieces:1
Class:Winonaite
Shock stage:low
Weathering grade:low
Fayalite (mol%):2.9-3.0
Ferrosilite (mol%):2.7-3.0
Wollastonite (mol%):1.1-1.0
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):20.2
Type spec location:UWB
Main mass:D. Pitt
Comments:MVCH 335; submitted by A. Irving
Plots: O isotopes:  
Institutions
   and collections
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
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)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6365 approved meteorites from (Northwest Africa) (plus 2024 unapproved names)

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