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Northwest Africa 13734
Basic information Name: Northwest Africa 13734
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13734
Observed fall: No
Year found: 2020
Country: Algeria
Mass:help 2.9 kg
Classification
  history:
Recommended:  Eucrite-mmict    [explanation]

This is 1 of 269 approved meteorites classified as Eucrite-mmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 6 Feb 2021
Writeuphelp
Writeup from MB 110:

Northwest Africa 13734 (NWA 13734)

Algeria

Purchased: 2020

Classification: HED achondrite (Eucrite, monomict)

History: Purchased by Jesper Grønne in 2020 from a Moroccan dealer.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Monomict breccia composed of microgabbroic eucrite clasts and related crystalline debris in a finer grained matrix. Minerals are exsolved pigeonite (pale orange in thin section), calcic plagioclase (polycrystalline), silica polymorph, Ti-chromite, ilmenite and troilite.

Geochemistry: Low-Ca pyroxene (Fs60.1-62.0Wo1.8-3.6, FeO/MnO = 31-35, N = 5), augite exsolution lamellae (Fs26.1-26.7Wo43.8-44.2, FeO/MnO = 30-34, N = 5), plagioclase (An86.9-90.2Or0.4-0.2, N = 4).

Classification: Eucrite (monomict breccia, microgabbroic, shocked).

Specimens: 20.2 g including one polished thin section at UWB; remainder with Mr. J. Grønne.

Data from:
  MB110
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2020
Mass (g):2900
Pieces:1
Class:Eucrite-mmict
Shock stage:moderate
Weathering grade:low
Ferrosilite (mol%):60.1-62.0; 26.1-26.7
Wollastonite (mol%):1.8-3.6; 43.8-44.2
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):20.2
Type spec location:UWB
Main mass:J. Grønne
Comments:Work name JG 050; 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)
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)
Catalogs:
References: Published in Gattacceca J., McCubbin F.M., Grossman J., Bouvier A., Chabot N.L., D'Orazio M., Goodrich C., Greshake A., Gross J., Komatsu M., Miao B., and Schrader D. (2022) The Meteoritical Bulletin, No. 110. Meteorit. Planet. Sci. 1-4
Find references in NASA ADS:
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Geography:

Algeria
Coordinates:Unknown.

Statistics:
     This is 1 of 1232 approved meteorites from Algeria (plus 29 unapproved names) (plus 4 impact craters)

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