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Northwest Africa 13756
Basic information Name: Northwest Africa 13756
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13756
Observed fall: No
Year found: 2020
Country: Niger
Mass:help 201 g
Recommended:  R4    [explanation]

This is 1 of 67 approved meteorites classified as R4.   [show all]
Search for other: Rumuruti chondrites, Rumuruti chondrites (type 4-7)
Comments: Approved 13 Mar 2021
Writeup from MB 110:

Northwest Africa 13756 (NWA 13756)


Purchased: 2020 Feb

Classification: Rumuruti chondrite (R4)

History: Purchased by Mbark Arjdal in February 2020 from dealer in Niger.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Distinct, relatively well-equilibrated chondrules (some with rare magnesian olivine cores) plus Type 4 lithic clasts are set in a fine grained matrix (orange-brown in thin section). Both sodic and calcic plagioclase are present, in addition to accessory ilmenite, aluminous Ti-bearing chromite, altered troilite and rare altered FeNi sulfide. Metal is absent.

Geochemistry: Olivine (Fa39.3±0.7, range Fa38.0-40.2, N = 6), magnesian olivine core (Fa4.4), augite (Fs10.5±0.7Wo44.0±1.5, range Fs9.9-11.3Wo42.4-45.3, N = 3), low-Ca pyroxene (Fs3.2Wo0.8; Fs30.6Wo1.3; N = 2), aluminous low-Ca pyroxene (Fs10.8Wo3.9, Al2O3 = 14.1 wt.%).

Classification: R4 chondrite breccia.

Specimens: 32.7 g including one polished thin section at UWB; remainder with Mr. M. Arjdal.

Data from:
  Table 0
  Line 0:
Place of purchase:Niger
Date:P 2020 Feb
Mass (g):201
Shock stage:low
Weathering grade:low
Fayalite (mol%):39.3±0.7
Ferrosilite (mol%):10.5±0.7
Wollastonite (mol%):44.0±1.5
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):32.7
Type spec location:UWB
Main mass:M. Arjdal
Comments:Work name Arj ZM 506; 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 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
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     This is 1 of 106 approved meteorites from Niger (plus 4 unapproved names)

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