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Northwest Africa 14575
Basic information Name: Northwest Africa 14575
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 14575
Observed fall: No
Year found: 2014
Country: Morocco
Mass:help 39.9 g
Recommended:  CV3    [explanation]

This is 1 of 593 approved meteorites (plus 1 unapproved name) classified as CV3.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CV chondrites, and CV-CK clan chondrites
Comments: Approved 12 Feb 2022
Writeup from MB 111:

Northwest Africa 14575 (NWA 14575)


Purchased: 2014

Classification: Carbonaceous chondrite (CV3)

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 M58924

Physical characteristics: Irregular individual with no fusion crust but well-developed desert polish-modified broken surfaces showing chondrules and chondrule-sized sockets up to 3 mm diameter. Weathering is low to moderate.

Petrography: Interior of the stone revealed by a 4 cm2 cut surface and polished thin section shows well defined chondrules, AOAs and calcium aluminum-rich inclusions set in a dark matrix which occupies 35 vol% of the stone. Chondrules are dominantly intact POP, PO and BO types with igneous rims, with average size 737±268 µm (n=26), occupying 20 vol% of the stone. AOAs are ovoid to irregular objects up to 1200 µm size, occupying 30 vol%. Olivine grains throughout show sharp to undulatory extinction. CAIs are 15 vol%. Accessory phases are troilite as inclusions in some chondrules and magnetite as a phase in matrix and rim material.

Geochemistry: EPMA: Olivine: 17.94±16.86 (n=30). Olivine in chondrules: 3.43±2.97 (n=8). Ca-poor pyroxene: Fs6.25±13.06, Wo1.83±1.10 (n=13). Ca-rich pyroxene: Fs1.82±1.76, Wo40.12±4.79 (n=16). Magnetite compositions (wt%): Cr2O3=1.76±0.54, TiO2=0.08±0.2, NiO=0.05±0.07, Al2O3=1.00±0.17 (n=22)

Classification: CV3 (S2) low weathering: Chondrule size, PO and POP prevalence, igneous rims, chondrule olivine low Fa composition and magnetite compositions indicate CV chondrite.

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

Data from:
  Table 0
  Line 0:
Place of purchase:Denver, USA
Date:P 2014
Mass (g):39.85
Shock stage:S2
Weathering grade:low
Fayalite (mol%):17.94±16.86
Ferrosilite (mol%):6.25±13.06; 1.82±1.76
Wollastonite (mol%):1.83±1.10; 40.12±4.79
Classifier:P.McCausland, V. Di Cecco, ROM
Type spec mass (g):8.24
Type spec location:ROM
Main mass:D. 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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