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Northwest Africa 14670
Basic information Name: Northwest Africa 14670
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 14670
Observed fall: No
Year found: 2008
Country: Morocco
Mass:help 22.5 g
Recommended:  H3    [explanation]

This is 1 of 703 approved meteorites (plus 2 unapproved names) classified as H3.   [show all]
Search for other: H chondrites, H chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 12 Feb 2022
Writeup from MB 111:

Northwest Africa 14670 (NWA 14670)


Purchased: 2008

Classification: Ordinary chondrite (H3)

History: Sample was purchased at the Tucson Mineral show in 2008 from A. Aaronson, who acquired it from Morocco. Sample is catalogued at the Royal Ontario Museum as M58500.

Physical characteristics: Thumb-sized friable individual with two fusion crust faces and slightly weathered broken surfaces containing metal and some chondrules. Physical properties: Magnetic susceptibilty of a 17.38 g specimen is log χ (× 10-9 m3/kg) = 5.08.

Petrography: Cut surfaces reveal a gray interior with abumdant mm-sized metal grains and aggregates. In thin section, a dark, slightly recrystallized matrix contains chondrules, chondrule fragments, individual grains and metal grains and metal-silicate aggregates, all bearing fine grained rims. Chondrule types are predominantly POP, PP and CC. Chondrule mesostasis is typically microscrystalline and dark. Pyroxene and olivine grains typically show sharp extinction. In BSE images, olivine shows zoning in PO and POP chondrules and some matrix grains.

Geochemistry: EPMA: olivine Fa20.04±6.00 (n=29); Ca-poor pyroxene Fs14.18±3.74, Wo1.30±0.98 (n=23); Ca-rich pyroxene Fs5.49±0.23Wo46.24±0.27 (n=3), one grain Fs14.25, Wo25.27.

Classification: Ordinary chondrite: H3 (S1) W1. Dark but slightly recrystallized matrix and chondrule mesostases, along with Fa and Fs variation in EPMA data suggest type 3. Abundance of metal and magnetic susceptibility indicate type H.

Specimens: Type specimen ROM; main mass DGregory

Data from:
  Table 0
  Line 0:
Place of purchase:Tucson, USA
Date:P 2008
Mass (g):22.52
Shock stage:S1
Weathering grade:W1
Fayalite (mol%):20.04±6.00
Ferrosilite (mol%):14.18±3.74, 5.49±0.23
Wollastonite (mol%):1.30±0.98, 46.24±0.27
Magnetic suscept.:5.08
Classifier:P. McCausland (ROM, UWO), V Di Cecco (ROM)
Type spec mass (g):5.14
Type spec location:ROM
Main mass:DGREGORY
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)
UWO: University of Western Ontario, Department of Earth Sciences, BGS 1026, 1151 Richmond St. N, London, Ontario, Canada N6A 5B7, Canada (institutional address; updated 18 Jul 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 Meteoritical Bulletin, no. 111, in preparation (2022)
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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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