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Northwest Africa 15310
Basic information Name: Northwest Africa 15310
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15310
Observed fall: No
Year found: 2022
Country: (Northwest Africa)
Mass:help 81 g
Recommended:  LL4    [explanation]

This is 1 of 387 approved meteorites classified as LL4.   [show all]
Search for other: LL chondrites, LL chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 1 Oct 2022
Writeup from MB 111:

Northwest Africa 15310 (NWA 15310)

(Northwest Africa)

Purchased: 2022

Classification: Ordinary chondrite (LL4)

History: Purchased by Shun-Chung Yang in 2022 from a dealer in Tindouf, Algeria.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Very fresh shock-darkened specimen with no secondary terrestrial alteration of primary metal, which is also unusually Ni-rich. Well-formed equilibrated chondrules containing sodic plagioclase are set in a very fine-grained matrix (opaque in thin section, with some textural evidence of melting) containing accessory Ni-rich kamacite, Ni-rich taenite, Ti-chromite and troilite.

Geochemistry: Olivine (Fa27.7±0.1, range Fa27.6-27.8, N = 5), low-Ca pyroxene (Fs22.6±0.4Wo1.5±0.2, range Fs22.3-23.1Wo1.3-1.8, N = 4), augite (Fs7.8±0.1Wo46.7±0.6, range Fs7.7-7.8Wo46.3-47.1, N = 3), kamacite (Ni 11.9-13.8 wt.%, N = 2), taenite (Ni 29.4 wt.%).

Classification: Ordinary chondrite (LL4, relatively highly shocked with anomalously Ni-rich constituent metal).

Specimens: 16.7 g including one polished thin section at UWB; remainder with Mr. S.-C. Yang.

Data from:
  Table 0
  Line 0:
Place of purchase:Tindouf
Date:P 2022
Mass (g):81
Shock stage:S4
Weathering grade:W0
Fayalite (mol%):27.7±0.1
Ferrosilite (mol%):22.6±0.4
Wollastonite (mol%):1.5±0.2
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):16.7
Type spec location:UWB
Main mass:S.-C. Yang
Comments:Work name SCY-65; submitted by A. Irving
   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)
References: Published in Meteoritical Bulletin, no. 111, in preparation (2022)
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     This is 1 of 8777 approved meteorites from (Northwest Africa) (plus 1879 unapproved names)

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