Meteoritical Bulletin: Entry for Northwest Africa 14756

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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: 282 g

Classification
history:

Recommended:

LL3.15 [explanation]

This is 1 of 14 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

Writeup

help

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 (Fa_23.5±11.1, range Fa_0.2-78.4, N = 3; Cr₂O₃ in ferroan olivine 0.03-0.48 wt.%, mean 0.18±0.12 wt.%, N = 33), low-Ca pyroxene (Fs_9.8±5.1Wo_1.1±1.1, range Fs_4.2-17.6Wo_0.2-3.2, N = 7), pigeonite (Fs_23.6Wo_15.0), subcalcic augite (Fs_11.8Wo_31.5). 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, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
Twelker: Eric Twelker, P.O. Box 844, Port Townsend, WA 98368, United States; Website (private address; updated 1 Dec 2014)
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:
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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 8495 approved meteorites from (Northwest Africa) (plus 1899 unapproved names)

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