Meteoritical Bulletin: Entry for Northwest Africa 15506

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Northwest Africa 15506

Basic information

Name: Northwest Africa 15506
This is an OFFICIAL meteorite name.
Abbreviation: NWA 15506
Observed fall: No
Year found: 2022
Country: (Northwest Africa)
Mass: 1700 g

Classification
history:

Recommended:

LL3 [explanation]

This is 1 of 441 approved meteorites classified as LL3. [show all]
Search for other: LL chondrites, LL chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)

Comments:

Approved 7 Jan 2023

Writeup

help

Writeup from MB 112:

Northwest Africa 15506 (NWA 15506)

(Northwest Africa)

Purchased: 2022

Classification: Ordinary chondrite (LL3)

History: Purchased by Nicholas Gessler in 2022 from a Moroccan dealer.

Physical characteristics: A single stone (1700 g) ~70% covered by a patchy thin fusion crust.

Petrography: (A. Irving, UWS and J. Boesenberg, BrownU) Well-formed unequilibrated chondrules (apparent diameter 970±430 µm, N = 25) containing devitrified glass are set in a fine grained matrix containing altered kamacite, low-Al high-Fe chromite and troilite.

Geochemistry: Olivine (Fa_12.5±8.9, range Fa_0.4-34.3, N = 22; Cr₂O₃ in ferroan olivine 0.06-0.43 wt.%, mean 0.15±0.09 wt.%, N = 18), low-Ca pyroxene (Fs_14.3±10.5Wo_1.2±1.1, range Fs_2.8-32.3Wo_0.2-4.1, N = 10), pigeonite (Fs_9.4Wo_7.3). Magnetic susceptibility log χ (× 10^-9 m³/kg) = 3.51.

Classification: Ordinary chondrite (LL3 ). The mean and standard deviation of Cr₂O₃ contents in ferroan olivine are consistent with a relatively low (but unspecified) petrologic subtype according to Figure 15a in Grossman and Brearley (2005).

Specimens: 22.2 g plus one polished thin section at UWB; remainder with Mr. N. Gessler.

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:
  MB112
  Table 0
  Line 0:

Place of purchase:	Morocco
Date:	P 2022
Mass (g):	1700
Pieces:	1
Class:	LL3
Shock stage:	S2
Weathering grade:	W2/3
Fayalite (mol%):	12.5±8.9
Ferrosilite (mol%):	14.3±10.5
Wollastonite (mol%):	1.2±1.1
Classifier:	A. Irving, UWS, and J. Boesenberg, BrownU
Type spec mass (g):	22.2
Type spec location:	UWB
Main mass:	N. Gessler
Comments:	Work name NG-EY; 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)
Gessler: Nicholas Gessler, 2010 Calgary Lane, Los Angeles, CA 90077, United States (private address; updated 7 Jul 2016)
BrownU: Brown University Providence, RI 02912, United States (institutional address; updated 7 Sep 2019)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 111, in preparation (2023)

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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 8904 approved meteorites from (Northwest Africa) (plus 1871 unapproved names)

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