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Northwest Africa 14998
Basic information Name: Northwest Africa 14998
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 14998
Observed fall: No
Year found: 2021
Country: (Northwest Africa)
Mass:help 404 g
Classification
  history:
Recommended:  LL3.15    [explanation]

This is 1 of 17 approved meteorites classified as LL3.15.   [show all]
Search for other: LL chondrites, LL chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 6 Aug 2022
Writeuphelp
Writeup from MB 111:

Northwest Africa 14998 (NWA 14998)

(Northwest Africa)

Purchased: 2021

Classification: Ordinary chondrite (LL3.15)

History: Purchased by Shun-Chung Yang and Juan Chen in 2021 from a dealer in Tindouf, Algeria.

Petrography: (A. Irving, UWS and J. Boesenberg, BrownU) Well-formed, closely packed unequilibrated chondrules (apparent diameter 880±420 µm, N = 25) containing both glass and devitrified glass are set in a fine grained matrix containing stained kamacite, chromite and troilite.

Geochemistry: Olivine (Fa19.8±11.2, range Fa0.8-41.3, N = 18; Cr2O3 in ferroan olivine 0.00-0.67 wt.%, mean 0.16±0.16 wt.%, N = 32), low-Ca pyroxene (Fs18.4±10.9Wo1.5±1.0, range Fs3.1-43.4Wo0.3-3.0, N = 12), pigeonite (Fs24.7Wo6.6), subcalcic augite (Fs9.4Wo36.6). Magnetic susceptibility log χ (× 10-9 m3/kg) = 4.07.

Classification: Ordinary chondrite (LL3.15). Petrologic subtype based on mean and standard deviation of Cr2O3 contents in ferroan olivine per Figure 15 in Grossman and Brearley (2005).

Specimens: 25.2 g including one polished thin section at UWB; remainder with Mr. S.-C. Yang and Mr. J. Chen.

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:
  MB111
  Table 0
  Line 0:
Place of purchase:Tindouf
Date:P 2021
Mass (g):404
Pieces:1
Class:LL3.15
Shock stage:S2
Weathering grade:W1/2
Fayalite (mol%):20.9±10.4
Ferrosilite (mol%):13.6±6.7
Wollastonite (mol%):0.7±0.7
Magnetic suscept.:4.07
Classifier:A. Irving, UWS, and J. Boesenberg, BrownU
Type spec mass (g):25.2
Type spec location:UWB
Main mass:S.-C. Yang and J. Chen
Comments:Work name SCY-55; 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)
BrownU: Brown University Providence, RI 02912, United States (institutional address; updated 7 Sep 2019)
Catalogs:
References: Published in Meteoritical Bulletin, no. 111, in preparation (2022)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 8674 approved meteorites from (Northwest Africa) (plus 1882 unapproved names)

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