Meteoritical Bulletin: Entry for Northwest Africa 11990

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Northwest Africa 11990

Basic information

Name: Northwest Africa 11990
This is an OFFICIAL meteorite name.
Abbreviation: NWA 11990
Observed fall: No
Year found: 2005
Country: (Northwest Africa)
Mass: 25.5 g

Classification
history:

Meteoritical Bulletin:	MB 108	(2020)	L3
Recommended:			L3 [explanation]

This is 1 of 848 approved meteorites (plus 2 unapproved names) classified as L3. [show all]
Search for other: L chondrites, L chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)

Comments:

Approved 17 Jun 2019

Writeup

Writeup from MB 108:

Northwest Africa 11990 (NWA 11990)

(Northwest Africa)

Purchased: 2005

Classification: Ordinary chondrite (L3)

History: Purchased by an anonymous collector from a dealer at the Munich Show in 2005, subsequently acquired by the Hollis Collection and then donated to PSF.

Petrography: (A. Irving and S. Kuehner, UWS) Fairly closely packed, well-formed chondrules (apparent diameter 840±480 µm, N = 20) are set in a finer grained matrix containing stained metal.

Geochemistry: Olivine (Fa_22.3±4.7(range Fa_11.9-24.8), Cr₂O₃ in ferroan examples 0.04-0.30 wt.%, mean 0.09±0.11 wt.%, N = 7), low-Ca pyroxene (Fs_13.9±8.6Wo_1.3±1.5(range Fs_2.8-20.9Wo_0.3-3.4), N = 4), high-Ca pyroxene (Fs_8.4Wo_44.4; Fs_10.8Wo_37.6). Magnetic susceptibility log χ (× 10^-9 m³/kg) = 4.78.

Classification: Ordinary chondrite (L3).

Specimens: The entire specimen including one polished thin section is at PSF.

Data from:
  MB108
  Table 0
  Line 0:

Place of purchase:	Munich
Date:	P 2005
Mass (g):	25.54
Pieces:	1
Class:	L3
Shock stage:	S2
Weathering grade:	W1/2
Fayalite (mol%):	22.3±4.7
Ferrosilite (mol%):	13.9±8.6
Wollastonite (mol%):	1.3±1.5
Classifier:	A. Irving and S. Kuehner, UWS
Type spec mass (g):	25.54
Type spec location:	PSF
Main mass:	PSF
Comments:	Work name CHC18030; submitted by A. Irving

Institutions
and collections

PSF: Planetary Studies Foundation,10 Winterwood Lane, Unit B, Galena, Illinois 61036-9283, United States; Website (institutional address; updated 1 Dec 2011)
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150

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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9710 approved meteorites from (Northwest Africa) (plus 1853 unapproved names)

Also see:

This lists the most popular meteorites among people who looked up this meteorite.

Revision
history:

This lists important revisions made to data for this record.

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