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Northwest Africa 14508
Basic information Name: Northwest Africa 14508
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 14508
Observed fall: No
Year found: 2012
Country: Morocco
Mass:help 338 g
Recommended:  CO3    [explanation]

This is 1 of 642 approved meteorites (plus 1 unapproved name) classified as CO3.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CM-CO clan chondrites, and CO chondrites
Comments: Approved 15 Dec 2021
Writeup from MB 110:

Northwest Africa 14508 (NWA 14508)


Purchased: 2012

Classification: Carbonaceous chondrite (CO3)

History: Sample was purchased from A. Aaronson in Tucson, USA in 2012 who acquired it from Morocco. Sample is catalogued at the Royal Ontario Museum as M58209

Physical characteristics: Fist-sized rounded pyramidal individual showing 70% fusion crust on three faces and one broken surface face, all with well-developed desert polish. Broken surface suggests presence of chondrules. Sample is somewhat attracted to a magnet.

Petrography: Cut faces reveal a grey mottled interior bearing small chondrules and a few vol% metal in sub-mm grains. In petrographic thin section, the bulk rock consists mostly of small chondrules (310 ± 161 µm; n=30), chondrule fragments, subhedral olivine grains and abundant CAIs (5 vol%). All inclusions are enclosed in dark fine-grained rims up to 20 µm thick. Matrix component is <30 vol%. Olivine in chondrules and as individual grains exhibits sharp to undulatory extinction. Magnetite grains absent. Troilite is abundant as small (10 to 30 µm) subrounded grains typically as inclusions in chondrule olivine.

Geochemistry: EPMA Olivine: 27.45±15.05 (n=31). Ca-poor pyroxene: Fs3.21±1.99En95.17±2.81Wo1.62±1.36 (n=16); Ca-rich pyroxene: Fs1.99±1.55En55.79±4.62Wo42.32±5.54 (n=13). Oxygen Isotopes (K. Ziegler, UNM): 3 acid-washed fragments analyzed by laser fluorination gave: δ18O=-2.175, -1.050, -2.968; δ17O=-6.026, -5.116, -6.871; δ17O=-4.878, -4.562, -5.303 (all per mil).

Classification: CO3 (S1) moderate weathering: Small chondrule size, matrix-poor, fragments and olivine grains enclosed by dark fine grained rims, presence of abundant sulfide, O-isotopes all consistent with CO classification.

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

Data from:
  Table 0
  Line 0:
Place of purchase:Tucson, USA
Date:P 2012
Mass (g):338.45
Shock stage:S1
Weathering grade:moderate
Fayalite (mol%):27.45±15.05
Ferrosilite (mol%):3.21±1.99
Wollastonite (mol%):1.62±1.36
Classifier:P.McCausland, V. Di Cecco, ROM
Type spec mass (g):47.45
Type spec location:ROM
Main mass:DGregory
Comments:Submitted by V. Di Cecco, ROM
Plots: O isotopes:  
   and collections
ROM: Royal Ontario Museum, 100 Queen's Park, Toronto, Ontario M5S 2C6, Canada (institutional address; updated 18 Oct 2011)
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
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)
References: Published in Gattacceca J., McCubbin F.M., Grossman J., Bouvier A., Chabot N.L., D'Orazio M., Goodrich C., Greshake A., Gross J., Komatsu M., Miao B., and Schrader D. (2022) The Meteoritical Bulletin, No. 110. Meteorit. Planet. Sci. 1-4
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     This is 1 of 2012 approved meteorites from Morocco (plus 35 unapproved names) (plus 1 impact crater)

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