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Northwest Africa 14591
Basic information Name: Northwest Africa 14591
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 14591
Observed fall: No
Year found: 2014
Country: Morocco
Mass:help 41.2 g
Recommended:  CK3    [explanation]

This is 1 of 74 approved meteorites classified as CK3.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CK chondrites, CK3 chondrites, and CV-CK clan chondrites
Comments: Approved 29 Jan 2022
Writeup from MB 111:

Northwest Africa 14591 (NWA 14591)


Purchased: 2014

Classification: Carbonaceous chondrite (CK3)

History: Sample was purchased from A. Aaronson in Denver in 2014 who acquired it from Morocco. Sample is catalogued at the Royal Ontario Museum as M58925.

Physical characteristics: A small individual with approximately 60% black fusion crust and un-weathered grey broken surfaces. Desert polish is moderately developed. In the broken surfaces large chondrules and CAIs are readily visible. Magnetic susceptibility of a 33.99 g fragment is log χ (× 10-9 m3/kg) = 4.71.

Petrography: Cut surfaces reveal a gray matrix containing large chondrules, amoeboid olivine aggregates and some CAIs. No metal is present. In thin section, silicates show very minor Fe-oxide staining and appear fresh. Chondrules of typically POP, BO types average 725±322 µm (n=23) diameter, and have igneous rims. Chondrules constitute 15 vol% of the rock, with AOAs 5 vol% and irregular CAIs 5 vol%. Subrounded dark inclusions of up to 400 µm size are also present, bearing abundant sulfide grains. The meteorite matrix is dark and slightly recrystallized, with some regions of the matrix transitioning to darker and much finer grained. All clastic objects have dark, fine grained rims. Olivine in chondrules and AOAs typically shows sharp extinction. In reflected light, abundant matrix olivine grains have a spongy appearance, and in transmitted light typically have cloudy interiors. Magnetite is abundant, having a spongy appearance in both chondrules and smaller matrix grains. Accessory sulfides are troilite and possibly pyrrhotite. In BSE images, olivine in chondrules is typically zoned to Fe-poor cores, but only for olivine grains well removed from chondrule rims. Olivine near chondrule rims appears equilibrated with matrix olivine.

Geochemistry: EPMA: Olivine Fa25.47±10.82 (n=31). Olivine in unequilibrated chondrules Fa20.62±13.38 (n=16); olivine in matrix Fa31.38±0.23 (n=7). Ca-poor pyroxene Fs6.87±9.05En90.59±9.53Wo2.54±2.43(n=10). Ca-rich pyroxene Fs4.56±4.24En50.37±8.58Wo45.07±5.27 (n=16). Magnetite compositions (wt%): Cr2O3=2.50±0.17, TiO2=0.55±0.05, NiO=0.33±0.02, Al2O3=2.61±0.13 (n=20).

Classification: CK3 (S1) W1: Chondrule olivine with zoned varying composition Fa0.6 up to Fa32 and abundant, well-equilibrated Fa31.38 matrix olivine suggests CK3 classification. Abundant magnetite has enriched Cr, Ti, Ni and Al compositions consistent with CK chondrites.

Specimens: Type specimen: ROM. Main mass: D. Gregory

Data from:
  Table 0
  Line 0:
Place of purchase:Denver, USA
Date:P 2014
Mass (g):41.16
Shock stage:S1
Weathering grade:W1
Fayalite (mol%):25.47±10.82
Ferrosilite (mol%):6.87±9.05
Wollastonite (mol%):2.54±2.43
Magnetic suscept.:4.71
Classifier:P. McCausland, V. Di Cecco, ROM
Type spec mass (g):8.3
Type spec location:ROM
Main mass:GREGORY
Comments:Submitted by V. Di Cecco, ROM
   and collections
ROM: Royal Ontario Museum, 100 Queen's Park, Toronto, Ontario M5S 2C6, Canada (institutional address; updated 18 Oct 2011)
Aaronson: Sahara Overland Ltd., Harhora, Temara, 12000, Morocco (private address; updated 3 Jan 2010)
References: Published in Meteoritical Bulletin, no. 111, in preparation (2022)
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     This is 1 of 1902 approved meteorites from Morocco (plus 27 unapproved names) (plus 1 impact crater)

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