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Northwest Africa 13677
Basic information Name: Northwest Africa 13677
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13677
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass:help 2.28 kg
Classification
  history:
Recommended:  Winonaite    [explanation]

This is 1 of 54 approved meteorites classified as Winonaite.   [show all]
Search for other: Primitive achondrites, Winonaites
Comments: Approved 30 Jan 2021
Writeuphelp
Writeup from MB 110:

Northwest Africa 13677 (NWA 13677)

(Northwest Africa)

Purchased: 2020 Feb

Classification: Primitive achondrite (Winonaite)

History: Purchased by Ziyao Wang in February 2020 from a dealer in Erfoud, Morocco.

Physical characteristics: This material consists of many small pieces (total 2279 g) found together at the same location. The amount of metal varies among individual pieces and some pieces contain two lithologies with different metal contents. Samples of metal-poor and more metal-rich lithologies were analyzed.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) The metal-poor lithology has a metamorphic triple grain junction texture (mean grainsize ~250 ┬Ám) and consists predominantly of forsterite, enstatite and diopside with accessory kamacite, sodic plagioclase, edenitic amphibole, taenite, troilite, schreibersite and rare merrillite. The metal-rich lithology contains the same silicate phases but has more metal (~20 vol.%), more plagioclase and less olivine, demonstrating that this meteorite is heterogeneous in modal mineralogy.

Geochemistry: Forsterite (Fa0.6-0.8, FeO/MnO = 2-3, N = 2), enstatite (Fs0.8Wo0.7; Fs3.6-4.7; FeO/MnO = 2-5, N = 6), diopside (Fs1.7-2.3Wo44.1-45.5, FeO/MnO =3, N = 4), plagioclase (Ab78.1-85.1An15.3-10.0Or6.7-2.4, N = 4).

Classification: Winonaite.

Specimens: 33.0 g including one polished thin section and two polished endcuts at UWB; remainder with Mr. Z. Wang.

Data from:
  MB110
  Table 0
  Line 0:
Place of purchase:Erfoud
Date:P 2020 Feb
Mass (g):2279
Pieces:many
Class:Winonaite
Shock stage:low
Weathering grade:low
Fayalite (mol%):0.6-0.8
Ferrosilite (mol%):0.8-4.7; 1.7-2.0
Wollastonite (mol%):0.7-2.1; 44.1-45.5
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):33.0
Type spec location:UWB
Main mass:Z. Wang
Comments:Work name WZY-03; 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: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7655 approved meteorites from (Northwest Africa) (plus 1972 unapproved names)

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