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Northwest Africa 14596
Basic information Name: Northwest Africa 14596
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 14596
Observed fall: No
Year found: 2014
Country: Morocco
Mass:help 104.2 g
Classification
  history:
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
Writeuphelp
Writeup from MB 111:

Northwest Africa 14596 (NWA 14596)

Morocco

Purchased: 2014

Classification: Carbonaceous chondrite (CK3)

History: Sample was purchased from A. Aaronson at the Tucson Mineral Show in 2014 who acquired it from Morocco. Sample is catalogued at the Royal Ontario Museum as M58926.

Physical characteristics: Small, flat specimen displaying 60% fusion crust cover, with one weathered, broken surface around much of the edge between fusion crust surfaces. CAIs are visible through fusion crust. Desert polish is moderately developed. Magnetic susceptibilty on a 9.82 g fragment is log χ (× 10-9 m3/kg) = 4.71.

Petrography: Cut surfaces show a gray matrix bearing large chondrules and some CAIs. In thin section, chondrules (15 vol%), calcium aluminum-rich inclusions (15 vol%) and amoeboid olivine aggregates (5 vol%) all bear dark fine-grained rims, well spaced in a dark fragmental matrix. Chondrules of dominantly POP, BO types average 910±424 µm (n=24) diameter, and typically have igneous rims. Several round dark inclusions ranging from 150 to 800 µm are also present, bearing fine magnetite-rich rims. Olivine in chondrules and martix shows sharp to undulatory extinction. Olivine in the matrix appears pitted with cloudy cores. No metal is present. Spongy textured magnetite occurs as small grains, isolated spherical aggregates in matrix and as grains in rim material and inclusions within chondrules. Troilite appears on some chondrule rims and as blocky isolated grains in the matrix. In BSE images, chondrule olivine grains are typically zoned to Fe-rich rims.

Geochemistry: EPMA: Olivine Fa20.76±11.91 (n=32); Chondrule olivine Fa17.95±12.06 (n=25); Matrix olivine Fa30.81±0.36 (n=7). Ca-poor pyroxene: Fs6.95±8.79En92.07±8.55Wo0.98±0.38 (n=14); Ca-rich pyroxene: Fs5.76±4.52En50.95±11.57Wo43.30±7.19 (n=15). Magnetite compositions: Cr2O3=2.50±0.22, TiO2=0.60±0.11, NiO=0.35±0.04, Al2O3=2.56±0.21 (n=20).

Classification: CK3 (S2) Moderately Weathered. Chondrule olivine variability and matrix olivine equilibration as well as magnetite compositions all fit criteria of CK. Cr2O3 content between 2 and 3 wt% indicates CK3.

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

Data from:
  MB111
  Table 0
  Line 0:
Place of purchase:Tucson, USA
Date:P 2014
Mass (g):104.17
Pieces:1
Class:CK3
Shock stage:S2
Weathering grade:moderate
Fayalite (mol%):20.76±11.91
Ferrosilite (mol%):6.95±8.79
Wollastonite (mol%):0.98±0.38
Magnetic suscept.:4.71
Classifier:P. McCausland, V. Di Cecco, ROM
Type spec mass (g):21.42
Type spec location:ROM
Main mass:DGregory
Comments:Submitted by V. Di Cecco, ROM
Institutions
   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)
DGregory: David Gregory, 230 First Avenue, Suite 108, St. Thomas, Ontario N5R 4P5, Canada (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 111, in preparation (2022)
Find references in NASA ADS:
Find references in Google Scholar:
Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 1902 approved meteorites from Morocco (plus 27 unapproved names) (plus 1 impact crater)

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