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Northwest Africa 14756
Basic information Name: Northwest Africa 14756
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 14756
Observed fall: No
Year found: 2021
Country: (Northwest Africa)
Mass:help 282 g
Classification
  history:
Meteoritical Bulletin:  MB 111  (2023)  LL3.15
Recommended:  LL3.15    [explanation]

This is 1 of 23 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 16 May 2022
Writeuphelp
Writeup from MB 111:

Northwest Africa 14756 (NWA 14756)

(Northwest Africa)

Purchased: 2021 Mar

Classification: Ordinary chondrite (LL3.15)

History: Purchased by Eric Twelker in March 2021 from a dealer in Agadir, Morocco.

Petrography: (A. Irving, UWS and J. Boesenberg, BrownU) Well-formed, closely packed, unequilibrated chondrules (apparent diameter 1140±1070 µm, N = 27) containing both glass and devitrified glass are set in a fine grained matrix containing stained kamacite, chromite and troilite.

Geochemistry: Olivine (Fa23.5±11.1, range Fa0.2-78.4, N = 3; Cr2O3 in ferroan olivine 0.03-0.48 wt.%, mean 0.18±0.12 wt.%, N = 33), low-Ca pyroxene (Fs9.8±5.1Wo1.1±1.1, range Fs4.2-17.6Wo0.2-3.2, N = 7), pigeonite (Fs23.6Wo15.0), subcalcic augite (Fs11.8Wo31.5). Magnetic susceptibility log χ (× 10-9 m3/kg) = 3.82.

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: 21.9 g plus one polished thin section at UWB; remainder with Twelker.

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:Agadir
Date:P 2021 Mar
Mass (g):282
Pieces:1
Class:LL3.15
Shock stage:S2
Weathering grade:W1
Fayalite (mol%):23.5±11.1
Ferrosilite (mol%):9.8±5.1
Wollastonite (mol%):1.1±1.1
Magnetic suscept.:3.82
Classifier:A. Irving, UWS, and J. Boesenberg, BrownU
Type spec mass (g):21.9
Type spec location:UWB
Main mass:Twelker
Comments:Work name ET21-6; 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, Burke Museum of Natural History and Culture, Box 353010 Seattle, WA 98195, United States (institutional address; updated 9 Oct 2023)
Twelker: Eric Twelker, P.O. Box 844, Port Townsend, WA 98368, United States; Website (private address; updated 1 Dec 2014)
BrownU: Joseph Boesenberg Brown University Dept of Earth, Environmental and Planetary Sciences (DEEPS) 324 Brook Street Providence, RI 02912 , United States (institutional address; updated 4 Jan 2024)
Catalogs:
References: Published in Gattacceca J., McCubbin F. M., Grossman J. N., Schrader D. L., Chabot N. L., D’Orazio M., Goodrich C., Greshake A., Gross J., Joy K. H., Komatsu M. and Miao B. (2023) The Meteoritical Bulletin, No. 111. Meteoritics & Planetary Science 58, 901–904. ?
Find references in NASA ADS:
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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9699 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)
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Revision
  history:
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