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Northwest Africa 13727
Basic information Name: Northwest Africa 13727
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13727
Observed fall: No
Year found: 2018
Country: Algeria
Mass:help 774 g
Classification
  history:
Recommended:  R3-5    [explanation]

This is 1 of 20 approved meteorites classified as R3-5.   [show all]
Search for other: Rumuruti chondrites, Rumuruti chondrites (type 3)
Comments: Approved 21 Feb 2021
Writeuphelp
Writeup from MB 110:

Northwest Africa 13727 (NWA 13727)

Algeria

Purchased: 2018

Classification: Rumuruti chondrite (R3-5)

History: Purchased by Jesper Grønne in 2018 from a dealer in Agadir, Morocco.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Breccia composed of discrete well-delineated chondrules plus lithic clasts in a fine grained matrix. Both unequilibrated and equilibrated chondrules are present. Some lithic clasts (Type 5) consist of sparse chondrules in a recrystallized matrix, whereas others consist of separated chondrules in an opaque matrix. Accessory minerals include sodic plagioclase (in the matrix), pyrrhotite, pentlandite, Ti-chromite, merrillite and Cr-magnetite; metal is absent and much of the sulfide is stained orange from secondary alteration.

Geochemistry: Olivine (Fa31.3±17.9, range Fa1.4-54.9, N = 8), low-Ca pyroxene (Fs3.9±2.6Wo1.2±0.6, range Fs2.0-5.7Wo0.8-1.6, N = 2), high-Ca pyroxene (Fs2.1Wo36.9; Fs1.3Wo49.7; Fs13.5Wo43.3; N = 3, plagioclase in chondrule (An89.2Or0.1), plagioclase in matrix (Ab88.4An7.5Or4.1), magnetite (Cr2O3 = 0.34 wt.%).

Classification: R3-5 chondrite breccia.

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:Agadir
Date:P 2018
Mass (g):774
Pieces:3
Class:R3-5
Shock stage:low
Weathering grade:low
Fayalite (mol%):31.3±17.9
Ferrosilite (mol%):3.9±2.6
Wollastonite (mol%):1.2±0.6
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 015; 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:

Algeria
Coordinates:Unknown.

Statistics:
     This is 1 of 1140 approved meteorites from Algeria (plus 27 unapproved names) (plus 4 impact craters)

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