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Northwest Africa 15305
Basic information Name: Northwest Africa 15305
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15305
Observed fall: No
Year found: 2022
Country: (Northwest Africa)
Mass:help 2.66 kg
Classification
  history:
Recommended:  Eucrite-unbr    [explanation]

This is 1 of 123 approved meteorites classified as Eucrite-unbr.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 1 Oct 2022
Writeuphelp
Writeup from MB 111:

Northwest Africa 15305 (NWA 15305)

(Northwest Africa)

Purchased: 2022 Mar

Classification: HED achondrite (Eucrite, unbrecciated)

History: Purchased by Terry Boudreaux in March 2022 from a dealer in Zagora, Morocco.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Unbrecciated igneous texture with a bimodal grainsize distribution of plagioclase and pyroxene. There are larger grains (phenocrysts) of plagioclase (up to ~2 mm) and pyroxene (up to ~1 mm), as well as clusters of intergrown smaller, equant pyroxene and plagioclase grains (mean grainsize ~0.3 mm). The sample is composed predominantly of exsolved pigeonite and anorthite together with accessory silica polymorph, Ti-chromite, ilmenite, troilite and stained Ni-free Fe metal.

Geochemistry: Orthopyroxene hosts (Fs49.4-49.7Wo1.7-2.0, FeO/MnO = 28-29, N = 4), augite exsolution lamellae (Fs20.6-21.0Wo42.1-42.6, FeO/MnO = 26-30, N = 4), anorthite (An91.1-93.2Or0.4-0.2, N = 4).

Classification: Eucrite (unbrecciated, porphyritic-microgabbroic).

Specimens: 28.7 g including one polished thin section at UWB; remainder with Boudreaux.

Data from:
  MB111
  Table 0
  Line 0:
Place of purchase:Zagora
Date:P 2022 Mar
Mass (g):2657
Pieces:1
Class:Eucrite-unbr
Shock stage:low
Weathering grade:low
Ferrosilite (mol%):49.4-49.7; 20.6-21.0
Wollastonite (mol%):1.7-2.0; 42.1-42.6
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):28.7
Type spec location:UWB
Main mass:Boudreaux
Comments:Work name RC161.1; 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)
Boudreaux: Terry Boudreaux, Illinois, United States (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 111, in preparation (2022)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 8777 approved meteorites from (Northwest Africa) (plus 1879 unapproved names)

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