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Northwest Africa 2403
Basic information Name: Northwest Africa 2403
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 2403
Observed fall: No
Year found: 2016
Country: (Northwest Africa)
Mass:help 625 g
Classification
  history:
Recommended:  Eucrite-unbr    [explanation]

This is 1 of 94 approved meteorites classified as Eucrite-unbr.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 7 Nov 2019
Writeuphelp
Writeup from MB 108:

Northwest Africa 2403 (NWA 2403)

(Northwest Africa)

Purchased: Jan 2016

Classification: HED achondrite (Eucrite, unbrecciated)

History: The meteorite was exported from Morocco to Tucson where it was purchased by N. Gessler.

Physical characteristics: 85% fusion crusted, locally dull with crazing and flow lines, elsewhere wind-polished and semi-glossy. The sawn interior is fine-grained, medium gray.

Petrography: The texture is unbrecciated subophitic, with grains typically 1 mm long, maximally 2 mm. Along with the usual eucrite preponderance of pyroxene and plagiolcase, minor ilmenite and silica, and very minor troilite, the rock contains scattered rather coarse Fe-metals, one of which is 1 mm long and vein-like in shape.

Geochemistry: Low-Ca pyroxene clusters near Fs59Wo2, augite near Fs25Wo44, both typical for a noncumulate eucrite. Pyroxene FeO/MnO averages (9 analyses) 31.8. Two plagioclase analyses show An81-85. The bulk composition, determined by INAA and fused-bead EPMA applied to 2 chips totaling 680 mg, is fairly nondescript for a eucrite, with bulk Mg/(Mg+Fe) ~ 40 mol%, 0.9 wt% TiO2, and 0.55 wt% Na2O.

Classification: Eucrite, unbrecciated.

Specimens: Main mass with Gessler, type specimen at UCLA.

Data from:
  MB108
  Table 0
  Line 0:
Place of purchase:Tucson
Date:P Jan 2016
Mass (g):625
Pieces:1
Class:Eucrite-unbr
Shock stage:S4
Weathering grade:mild (li
Ferrosilite (mol%):59 (low-Ca), 25 (high-Ca)
Wollastonite (mol%):2 (low-Ca), 44 (high-Ca)
Classifier:P. Warren, UCLA
Type spec mass (g):25
Type spec location:UCLA
Main mass:Nick Gessler
Finder:Anonymous
Comments:Gessler's address: 2010 Calgary Lane, Los Angeles, CA 90077; 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 Meteoritical Bulletin, no. 108, in preparation (2019)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7005 approved meteorites from (Northwest Africa) (plus 2002 unapproved names)

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