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Northwest Africa 16725
Basic information Name: Northwest Africa 16725
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 16725
Observed fall: No
Year found: 2023
Country: (Northwest Africa)
Mass:help 1421 g
Classification
  history:
Recommended:  Angrite    [explanation]

This is 1 of 54 approved meteorites classified as Angrite.   [show all]
Search for other: Achondrites, Angrites
Comments: Approved 4 Sep 2024
Writeuphelp
Writeup from MB 113:

Northwest Africa 16725 (NWA 16725)

(Northwest Africa)

Purchased: 2023 Oct

Classification: Angrite

History: Purchased by Ziyao Wang in October 2023 from a dealer in Zug, Western Sahara.

Petrography: (A. Irving, UWS, and P. Carpenter, WUSL) Protogranular aggregate (mean grainsize ~0.8 mm) composed predominantly of calcic olivine, Al-Ti-augite and near-endmember anorthite together with accessory Cr-pleonaste (translucent purplish-brown in thin section), kamacite, taenite, troilite, Fe-Ni sulfide and secondary Fe hydroxides. Some anorthite is present as polygranular aggregates and also as thin coronas or partial coronas around grains of augite and pleonaste. The estimated proportion of opaque phases is ~10 vol.%.

Geochemistry: Olivine (Fa38.7-39.1Ln1.3-2.2, FeO/MnO = 80-90, N = 4), Al-Ti-augite (Fs8.2-10.8Wo50.2-54.4, FeO/MnO = 66-82, Al2O3 1.7-8.2 wt.%, TiO2 0.1-1.7 wt.%, N = 6), anorthite (An99.2-99.6Or0.7-0.2, N = 4).

Classification: Angrite (protogranular). This material is likely paired with Rafsa 004 and Rafsa 007, and also is similar in many respects (including the presence of anorthite coronas) to NWA 2999 and other such paired specimens found and classified about 20 years earlier.

Specimens: 25.6 g including one polished thin section at UWB; remainder with WangZ.

Data from:
  MB113
  Table 0
  Line 0:
Place of purchase:Zug, Western Sahara
Date:P 2023 Oct
Mass (g):1421
Pieces:many
Class:Angrite
Shock stage:low
Weathering grade:low
Fayalite (mol%):38.7-39.1
Ferrosilite (mol%):8.2-10.8
Wollastonite (mol%):50.2-54.4
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):25.6
Type spec location:UWB
Main mass:WangZ
Comments:Work name WZY-194; 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, Burke Museum of Natural History and Culture, Box 353010 Seattle, WA 98195, United States (institutional address; updated 9 Oct 2023)
WangZ: Ziyao Wang, Hebei GEO University North Campus, Huai An dong road 127, Shijiazhuang, Hebei Province , China (private address; updated 25 Jun 2021)
Catalogs:
References: Published in Meteoritical Bulletin, no. 113, in preparation (2024)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9914 approved meteorites from (Northwest Africa) (plus 1841 unapproved names)

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