MetSoc Home            Publications            Contacts  
Search the Meteoritical Bulletin Database
Last update: 6 Oct 2021
Search for: Search type: Search limits: Display: Publication:
Text help
Starts with
Sounds like
Falls  Non-NWAs
What's new
  in the last:
Limit to approved meteorite names
Search text:  
Northwest Africa 12457
Basic information Name: Northwest Africa 12457
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12457
Observed fall: No
Year found: 2005
Country: (Northwest Africa)
Mass:help 314 g
Meteoritical Bulletin:  MB 108  (2020)  L3
Recommended:  L3    [explanation]

This is 1 of 727 approved meteorites (plus 1 unapproved name) classified as L3.   [show all]
Search for other: L chondrites, L chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 27 Mar 2019
Writeup from MB 108:

Northwest Africa 12457 (NWA 12457)

(Northwest Africa)

Purchased: 2005

Classification: Ordinary chondrite (L3)

History: Purchased by an anonymous collector from a dealer at the Munich Show in 2005, subsequently acquired by the Hollis Collection and then donated to PSF.

Petrography: (A. Irving and S. Kuehner, UWS) Well-formed chondrules (apparent diameter 700±310 µm, N = 22) are set in a finer matrix containing stained metal and merrillite. Several small L6 clasts were observed in the studied thin section.

Geochemistry: Olivine (Fa0.8-25.1, Cr2O3 in ferroan examples 0.03-0.05 wt.%, N = 7), orthopyroxene (Fs3.2-18.1Wo0.2-0.3, N = 3), subcalcic augite (Fs12.2Wo27.3), augite (Fs6.5-7.2Wo41.0-46.2, N = 2). Magnetic susceptibility log χ (× 10-9 m3/kg) = 4.85.

Classification: Ordinary chondrite (L3).

Specimens: The entire specimen including one polished thin section is at PSF.

Data from:
  Table 0
  Line 0:
Place of purchase:Munich
Date:P 2005
Mass (g):314
Shock stage:S2
Weathering grade:W1
Fayalite (mol%):19.6±9.6
Ferrosilite (mol%):11.1±7.5
Wollastonite (mol%):0.3±0.1
Magnetic suscept.:4.85
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):314
Type spec location:PSF
Main mass:PSF
Comments:Work name CHC18043; submitted by A. Irving
   and collections
PSF: Planetary Studies Foundation,10 Winterwood Lane, Unit B, Galena, Illinois 61036-9283, United States; Website (institutional address; updated 1 Dec 2011)
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
References: Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
Find references in NASA ADS:
Find references in Google Scholar:

     This is 1 of 7912 approved meteorites from (Northwest Africa) (plus 1974 unapproved names)

Direct link to this page