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Northwest Africa 1862
Basic information Name: Northwest Africa 1862
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 1862
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass:help 484 g
Recommended:  Ureilite    [explanation]

This is 1 of 613 approved meteorites classified as Ureilite.   [show all]
Search for other: Achondrites, Ureilites
Comments: Approved 1 Oct 2022
Writeup from MB 111:

Northwest Africa 1862 (NWA 1862)

(Northwest Africa)

Purchased: 2019

Classification: Ureilite

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

Physical characteristics: A subround single stone, 40% covered by relict, grainy, non-crazed, brown, lightly stained fusion crust, the other faces showing the texture of the individual crystals. Cut face shows "medium dark gray N4" overall appearance with laminar crystals <2 mm.

Petrography: The meteorite is a typical ureilite in terms of both texture and mode: mostly olivine, roughly 20% pigeonite, with a large component of interstitial opaque matter (presumably graphitic carbon). Olivine is anhedral-subequant and typically 1-2 mm, up to 3 mm across; pigeonite up to 2 mm. Olivine orientations show moderate (at least) lineation.

Geochemistry: Olivine core compositions (6 analyses) cluster tightly at Fa17.8, with FeO/MnO (wt ratio) = 42.9 and minor element contents of 0.66 wt% Cr2O3, 0.39 wt% MnO, 0.32 wt% CaO. Two practically identical pigeonite analyses are Fs15.4Wo7.5, with minor element contents of (wt%) Cr2O3 1.1, Al2O3 0.62, MnO 0.43.

Classification: Ureilite

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

Data from:
  Table 0
  Line 0:
Date:P 2019
Mass (g):484
Shock stage:S2
Weathering grade:moderate
Fayalite (mol%):17.8
Ferrosilite (mol%):15.4
Wollastonite (mol%):7.5
Classifier:P. Warren, UCLA
Type spec mass (g):34
Type spec location:UCLA
Main mass:Nick Gessler
Comments:Submitted by Paul Warren
   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)
References: Published in Meteoritical Bulletin, no. 111, in preparation (2022)
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     This is 1 of 8777 approved meteorites from (Northwest Africa) (plus 1879 unapproved names)

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