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Northwest Africa 10851
Basic information Name: Northwest Africa 10851
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 10851
Observed fall: No
Year found: 2002
Country: (Northwest Africa)
Mass:help 29.8 g
Meteoritical Bulletin:  MB 105  (2016)  Winonaite
Recommended:  Winonaite    [explanation]

This is 1 of 89 approved meteorites classified as Winonaite.   [show all]
Search for other: Primitive achondrites, Winonaites
Comments: Approved 26 Nov 2016
Writeup from MB 105:

Northwest Africa 10851 (NWA 10851)

(Northwest Africa)

Purchased: 2002 Jan

Classification: Primitive achondrite (Winonaite)

History: (I. Nicklin, ROM) Dr. David Gregory donated a lot of 345 meteorites to ROM in 2009. The pieces ranged in size from 14 × 11 × 8.5 cm to less than 1 × 1 × 1 cm, with an aggregate weight of 57.2 kg. These had been purchased from Dean Bessey in 2002 as NWA 869 material, acquired in Morocco. Based upon visual inspection of each piece, it was apparent that 18 of the specimens are unlike the predominant NWA 869 pieces, and most of these have subsequently been identified as other types of ordinary chondrites (e.g. H4 NWA 6998). However, the stone designated as M48964 and described here was clearly different.

Petrography: (A. Irving and S. Kuehner, UWS) Breccia composed of clasts exhibiting triple grain junction textures within a coarse grained matrix exhibiting similar texture. The grainsize in individual clasts varies and ranges from 0.1 mm to 0.2 mm. Minerals are predominantly enstatite with accessory forsterite, stained Ni-poor kamacite, schreibersite, daubreelite, troilite and pentlandite.

Geochemistry: Enstatite (Fs0.4-0.5Wo0.6-0.7, N = 3), forsterite (Fa0.2-0.3, N = 2). Oxygen isotopes (K. Ziegler, UNM): analysis of acid-washed subsamples by laser fluorination gave, respectively, δ17O 2.345, 2.149, 2.224; δ18O 5.438, 5.078, 5.242; Δ17O -0.526, -0.532, -0.544 per mil.

Classification: Winonaite (breccia).

Specimens: 8.18 g including one polished thin section at ROM; remainder with DGregory.

Data from:
  Table 0
  Line 0:
Place of purchase:Tucson
Date:P 2002 Jan
Mass (g):29.8
Shock stage:low
Weathering grade:low
Fayalite (mol%):0.2-0.3
Ferrosilite (mol%):0.4-0.5
Wollastonite (mol%):0.6-0.7
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):8.18
Type spec location:ROM
Main mass:DGregory
Comments:M48964; submitted by A. Irving
Plots: O isotopes:  
   and collections
ROM: Royal Ontario Museum, 100 Queen's Park, Toronto, Ontario M5S 2C6, Canada (institutional address; updated 18 Oct 2011)
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)
Bessey: Dean Bessey ,P.O. Box 40810, Glenfield, Auckland 1310 , New Zealand; Website (private address)
DGregory: David Gregory, 230 First Avenue, Suite 108, St. Thomas, Ontario N5R 4P5, Canada (private address)
References: Published in Meteoritical Bulletin, no. 105, MAPS 52, 2411, September 2017. http://onlinelibrary.wiley.com/doi/10.1111/maps.12944/full
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     This is 1 of 9829 approved meteorites from (Northwest Africa) (plus 1851 unapproved names)

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