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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
Classification
  history:
Recommended:  R4    [explanation]

This is 1 of 65 approved meteorites classified as R4.   [show all]
Search for other: Rumuruti chondrites, Rumuruti chondrites (type 4-7)
Comments: Approved 13 Mar 2021
Writeuphelp
Writeup from MB 110:

Northwest Africa 13756 (NWA 13756)

Niger

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:
  MB110
  Table 0
  Line 0:
Place of purchase:Niger
Date:P 2020 Feb
Mass (g):201
Pieces:1
Class:R4
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
Finder:anonymous
Comments:Work name Arj ZM 506; 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 Meteoritical Bulletin, no. 110, in preparation (2021)
Find references in NASA ADS:
Find references in Google Scholar:
Geography:

Niger
Coordinates:Unknown.

Statistics:
     This is 1 of 94 approved meteorites from Niger (plus 4 unapproved names)

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