Meteoritical Bulletin: Entry for Northwest Africa 1861

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Northwest Africa 1861

Basic information

Name: Northwest Africa 1861
This is an OFFICIAL meteorite name.
Abbreviation: NWA 1861
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass: 90 g

Classification
history:

Meteoritical Bulletin:	MB 111	(2023)	Eucrite
Recommended:			Eucrite [explanation]

This is 1 of 598 approved meteorites (plus 1 unapproved name) classified as Eucrite. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Comments:

Approved 23 Jul 2022

Writeup

help

Writeup from MB 111:

Northwest Africa 1861 (NWA 1861)

(Northwest Africa)

Purchased: 2019

Classification: HED achondrite (Eucrite)

History: The meteorite was exported from Morocco for purchase by N. Gessler.

Physical characteristics: A subround single stone, 100% covered by matte and splotchy black non-stained fusion crust. Cut face shows light gray N7 matrix with inclusions <6 mm.

Petrography: The meteorite is intensely brecciated. The matrix appears nearly opaque in thin section, with typical grain size 0.02 mm. Scattered clasts are up to 3 mm, the largest being an intensely brecciated-basalt with granoblastic polygonalism evident in the pyroxene.

Geochemistry: Pyroxene (14 analyses) ranges from Fs_48.6Wo_2.3to Fs_57.3Wo_4.2to Fs_39.6Wo_26.0, and averages Fs_50.9Wo_7.7, with FeO/MnO (wt ratio) = 33.6. Plagioclase (9 analyses) ranges from An_82.1to An_92.5and averages An_88.5.

Classification: Eucrite, brecciated, probably polymict

Specimens: Main mass with Gessler, type specimen, including multiple thin sections, at UCLA.

Data from:
  MB111
  Table 0
  Line 0:

Date:	P 2019
Mass (g):	90
Pieces:	1
Class:	Eucrite
Shock stage:	S2
Weathering grade:	moderate
Ferrosilite (mol%):	50.9
Wollastonite (mol%):	7.7
Classifier:	P. Warren, UCLA
Type spec mass (g):	22
Type spec location:	UCLA
Main mass:	Nick Gessler
Finder:	Anonymous
Comments:	Submitted by Paul Warren

Institutions
and collections

UCLA: Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA 90095-1567, United States (institutional address; updated 17 Oct 2011)
Gessler: Nicholas Gessler, 2010 Calgary Lane, Los Angeles, CA 90077, United States (private address; updated 7 Jul 2016)

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. ?

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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
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