header
  MetSoc Home            Publications            Contacts  
Search the Meteoritical Bulletin Database
Last update: 12 Mar 2024
Search for: Search type: Search limits: Display: Publication:
Names
Text help
Places
Classes
Years
Contains
Starts with
Exact
Sounds like
NonAntarctic
Falls  Non-NWAs
What's new
  in the last:
Limit to approved meteorite names
Search text:
 
Northwest Africa 15358
Basic information Name: Northwest Africa 15358
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15358
Observed fall: No
Year found: 2022
Country: (Northwest Africa)
Mass:help 260 g
Classification
  history:
Meteoritical Bulletin:  MB 111  (2023)  Eucrite-melt breccia-an
Recommended:  Eucrite-melt breccia-an    [explanation]

This is the only approved meteorite classified as Eucrite-melt breccia-an.
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 4 Dec 2022
Writeuphelp
Writeup from MB 111:

Northwest Africa 15358 (NWA 15358)

(Northwest Africa)

Purchased: 2022 Apr

Classification: Eucrite-melt breccia-an

History: Purchased in April 2022 by Bob Falls from a dealer in Tagounite, Morocco.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Breccia consisting of lithic microgabbroic clasts with sparse, dark interstitial matrix. Clasts are composed of exsolved pigeonite and calcic plagioclase together with accessory silica polymorph,ilmenite, troilite (some altered to Fe oxide) and Fe metal. Plagioclase exhibits evidence of moderate shock (undulose extinction to polycrystalline texture). The matrix is very fine grained, sepia brown to opaque in thin section, and has textural evidence of having been partly molten with entrained very small crystalline grains.

Geochemistry: Low-Ca pyroxene (Fs66.2-70.4Wo1.8-4.1, FeO/MnO = 30-32, N = 4), augite (Fs30.6-34.4Wo44.0-41.7, FeO/MnO = 33-36, N = 4), plagioclase (An86.1-89.4Or0.4-1.0, N = 3).

Classification: Eucrite (melt matrix breccia, anomalous). The pyroxenes in this specimen are much more ferroan than in typical eucrites, as also found in anomalous eucrites NWA 11729, NWA 12445, NWA 15076 and NWA 15202.

Specimens: 21.5 g plus two covered thin sections at UWB; remainder with Mr. R. Falls.

Data from:
  MB111
  Table 0
  Line 0:
Place of purchase:Tagounite
Date:P 2022 Apr
Mass (g):260
Pieces:1
Class:Eucrite-melt breccia-an
Shock stage:high
Weathering grade:low
Ferrosilite (mol%):66.2-70.4; 30.6-34.4
Wollastonite (mol%):1.8-4.1; 44.0-41.7
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):21.5
Type spec location:UWB
Main mass:R. Falls
Comments:Work names JC3.1 and BF22-28; 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)
Catalogs:
References: Published in Gattacceca J., McCubbin F. M., Grossman J. N., Schrader D. L., Chabot N. L., D’Orazio M., Goodrich C., Greshake A., Gross J., Joy K. H., Komatsu M. and Miao B. (2023) The Meteoritical Bulletin, No. 111. Meteoritics & Planetary Science 58, 901–904. ?
Find references in NASA ADS:
Find references in Google Scholar:
Photos:
CreditPhotos
Public domain photographs:
A. Irving   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9589 approved meteorites from (Northwest Africa) (plus 1869 unapproved names)
Crosslinks:
Also see:
  This lists the most popular meteorites among people who looked up this meteorite.
Revision
  history:
  This lists important revisions made to data for this record.

Direct link to this page