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Northwest Africa 8745
Basic information Name: Northwest Africa 8745
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 8745
Observed fall: No
Year found: 2014
Country: (Northwest Africa)
Mass:help 5.22 kg
Meteoritical Bulletin:  MB 106  (2018)  Eucrite-br
Recommended:  Eucrite-br    [explanation]

This is 1 of 218 approved meteorites classified as Eucrite-br.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 1 Mar 2017
Writeup from MB 106:

Northwest Africa 8745 (NWA 8745)

(Northwest Africa)

Purchased: 2014 Jun

Classification: HED achondrite (Eucrite, brecciated)

History: Purchased by Darryl Pitt in June 2014 from a dealer in Mauritania.

Physical characteristics: Single stone (5220 g) composed of pale clasts in a dark-brown matrix. Felsic lithic clasts exposed on the exterior have been eroded by desert ablation.

Petrography: (A. Irving and S. Kuehner, UWS) Breccia composed of diabasic eucrite clasts in a matrix of related debris plus some subcalcic augite grains. Clasts consist predominantly of exsolved pigeonite (some of which appears red-brown in thin section) and calcic plagioclase (polycrystalline) with accessory silica polymorph, ilmenite and troilite. Calcite is present in small vugs and barite is a minor constituent.

Geochemistry: Orthopyroxene host (Fs59.3-61.6Wo4.3-2.0, FeO/MnO = 32-33, N = 3), clinopyroxene exsolution lamellae (Fs25.8-26.6Wo44.2-43.6, FeO/MnO = 34-35, N = 3), subcalcic augite (Fs32.8Wo37.8, FeO/MnO = 32).

Classification: Eucrite (breccia, diabasic, shocked).

Specimens: 27.8 g including one polished thin section at UWB; the remainder is held by DPitt.

Data from:
  Table 0
  Line 0:
Place of purchase:Mauritania
Date:P 2014 Jun
Mass (g):5220
Shock stage:high
Weathering grade:moderate
Ferrosilite (mol%):59.3-61.6; 25.8-26.6
Wollastonite (mol%):4.3-2.0; 44.2-43.6
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):27.8
Type spec location:UWB
Main mass:D. Pitt
Comments:MAC 51; submitted by A. Irving
   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)
References: Published in Gattacceca J., Bouvier A., Grossman J., Metzler K., and Uehara M. (2019) Meteoritical Bulletin, no. 106. Meteorit. Planet. Sci. 54 in press.
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     This is 1 of 8904 approved meteorites from (Northwest Africa) (plus 1871 unapproved names)

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