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Northwest Africa 12913
Basic information Name: Northwest Africa 12913
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12913
Observed fall: No
Year found: 2016
Country: (Northwest Africa)
Mass:help 190.8 g
Classification
  history:
Meteoritical Bulletin:  MB 108  (2020)  L6
Recommended:  L6    [explanation]

This is 1 of 11485 approved meteorites (plus 6 unapproved names) classified as L6.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 26 Sep 2019
Writeuphelp
Writeup from MB 108:

Northwest Africa 12913 (NWA 12913)

(Northwest Africa)

Purchased: 20 Nov 2016

Classification: Ordinary chondrite (L6)

History: BBaecker purchased an NWA meteorite on Ebay on November 20, 2016, and donated 11 pieces to Cascadia on February 4, 2017.

Petrography: (M. Hutson, A. Ruzicka, R. Kostynick, Cascadia): The texture of the silicates in thin section is fairly integrated, with numerous readily distinguished chondrules. Plagioclase feldspar textures suggest fluidization. Chromite-plagioclase regions and maskelynite are present. A few crystalline grains exceed 50 microns in length. Thin veins caused by shock are present, many with droplets of metal/sulfide surrounding angular silicate clasts. Replacement of metal and sulfide is concentrated along veins filled with iron hydroxide, with alteration of metal and sulfide across the thin section being roughly 25-30%.

Geochemistry: Mineral compositions and geochemistry: Olivine and pyroxene grains are equilibrated: Fa24.9±0.5, N=12; Fs21.6±0.9Wo1.6±0.2, N=10.

Classification: Ordinary chondrite (L6) based on chemistry and texture.

Specimens: Cascadia holds 36.3 g in ten pieces, in addition to a polished thin section and a mounted butt. The main mass is held by BBaecker: Bastien Baecker, Huntsville, AL.

Data from:
  MB108
  Table 0
  Line 0:
Place of purchase:Ebay
Date:P 20 Nov 2016
Mass (g):190.8
Pieces:1
Class:L6
Shock stage:S4
Weathering grade:W2
Fayalite (mol%):24.9±0.5 (N=12)
Ferrosilite (mol%):21.6±0.9 (N=10)
Wollastonite (mol%):1.6±0.2 (N=10)
Classifier:M. Hutson and R. Kostynick, Cascadia
Type spec mass (g):36.3
Type spec location:Cascadia
Main mass:BBaecker
Comments:Lab number CML 0942; submitted by Melinda Hutson
Institutions
   and collections
Cascadia: Cascadia Meteorite Laboratory, Portland State University, Department of Geology, Room 17 Cramer Hall, 1721 SW Broadway, Portland, OR 97201, United States; Website (institutional address; updated 28 Oct 2011)
Catalogs:
References: Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7579 approved meteorites from (Northwest Africa) (plus 1969 unapproved names)

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