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Northwest Africa 13308
Basic information Name: Northwest Africa 13308
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13308
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass:help 168.1 g
Recommended:  Eucrite-unbr    [explanation]

This is 1 of 123 approved meteorites classified as Eucrite-unbr.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 13 Jun 2020
Writeup from MB 109:

Northwest Africa 13308 (NWA 13308)

(Northwest Africa)

Purchased: 2019 Dec

Classification: HED achondrite (Eucrite, unbrecciated)

History: Purchased by John Divelbiss in December 2019 from Mike Miller, who had acquired the stone from a Moroccan dealer in 2017.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) The specimen has a microgabbroic texture and is crosscut by multiple quenched shock melt veins enclosing crystal debris derived from the clasts. Minerals are exsolved pigeonite and calcic plagioclase with accessory silica polymorph, fayalite, Ti-Al chromite, ilmenite (some more Cr-rich), merrillite, baddeleyite, zircon and troilite.

Geochemistry: Low-Ca pyroxene (Fs57.8-60.0Wo2.5-4.8, FeO/MnO = 30-33, N = 6), high-Ca pyroxene (Fs25.9-26.7Wo43.3-44.2, FeO/MnO = 29-32, N = 6), fayalite (Fa84.6-87.8, FeO/MnO = 45-51, N = 2), plagioclase (An89.2-90.5Or0.4-0.5, N = 4).

Classification: Eucrite (unbrecciated, microgabbroic, shock melt-veined).

Specimens: 20.3 g including one polished thin section at UWB; remainder with Mr. J. Develbiss.

Data from:
  Table 0
  Line 0:
Place of purchase:Kingman, Arizona
Date:P 2019 Dec
Mass (g):168.1
Shock stage:high
Weathering grade:low
Fayalite (mol%):84.6-87.8
Ferrosilite (mol%):57.8-60.0; 25.9-26.7
Wollastonite (mol%):2.5-4.8; 43.3-44.2
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):20.3
Type spec location:UWB
Main mass:J. Divelbiss
Comments:Work name JD20-1; 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)
WUSL: Washington Univ., One Brookings Drive, St. Louis, MO 63130, United States (institutional address; updated 17 Oct 2011)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
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     This is 1 of 8746 approved meteorites from (Northwest Africa) (plus 1879 unapproved names)

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