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Northwest Africa 12521
Basic information Name: Northwest Africa 12521
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12521
Observed fall: No
Year found: 2018
Country: (Northwest Africa)
Mass:help 220 g
Classification
  history:
Recommended:  L3.1    [explanation]

This is 1 of 16 approved meteorites classified as L3.1.   [show all]
Search for other: L chondrites, L chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 27 Jun 2019
Writeuphelp
Writeup from MB 108:

Northwest Africa 12521 (NWA 12521)

(Northwest Africa)

Purchased: 2018 Nov

Classification: Ordinary chondrite (L3.1)

History: Purchased by Ben Hoefnagels in November 2018 from a dealer in Agadir, Morocco.

Petrography: (A. Irving and S. Kuehner, UWS) Very fresh specimen composed of well-formed chondrules (apparent diameter 860±430 µm, N = 24, excluding one large 5 mm chondrule in the studied thin section) plus some angular Type 3 lithic clasts (up to 1.6 mm across) set in a fine grained, metal-bearing matrix (~10 vol.%, black in thin section).

Geochemistry: Olivine Fa17.2±12.3 (n=8, randomly selected), range Fa1.7-59.4. Cr2O3 in ferroan examples 0.03-1.30 wt.%, mean 0.22±0.24 wt.%, N = 30), orthopyroxene (Fs1.5-33.2Wo0.3-1.0, N = 3), pigeonite (Fs26.8Wo14.9), augite (Fs17.1Wo35.8). Magnetic susceptibility log χ (× 10-9 m3/kg) = 4.64.

Classification: Ordinary chondrite (L3.1). Based on lack of equilibration of mafic silicates, chondrule sizes and magnetic susceptibility this specimen is an L3 chondrite, and the distribution of Cr in ferroan olivines is consistent with an L3.1 chondrite (similar to Adrar 003, as documented by Grossman and Brearley, 2005).

Specimens: 20.2 g including one polished thin section at UWB; remainder with Mr. B. Hoefnagels.

Bibliography:
  • Grossman J.N. and Brearley A.J. (2005) The onset of metamorphism in ordinary and carbonaceous chondrites. Meteorit. Planet. Sci. 40, 87-122. (link)
Data from:
  MB108
  Table 0
  Line 0:
Place of purchase:Agadir
Date:P 2018 Nov
Mass (g):220
Pieces:1
Class:L3.1
Shock stage:S2
Weathering grade:W0
Fayalite (mol%):17.2±12.3 (N=8)
Ferrosilite (mol%):16.5±15.9 (n=3)
Wollastonite (mol%):0.8±0.4
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):20.2
Type spec location:UWB
Main mass:B. Hoefnagels
Comments:Work name BH178; 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)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
Catalogs:
References: Published in Meteoritical Bulletin, no. 108, in preparation (2019)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6968 approved meteorites from (Northwest Africa) (plus 2012 unapproved names)

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