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Northwest Africa 14620
Basic information Name: Northwest Africa 14620
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 14620
Observed fall: No
Year found: 2012
Country: Morocco
Mass:help 139 g
Recommended:  H5    [explanation]

This is 1 of 10945 approved meteorites (plus 20 unapproved names) classified as H5.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 29 Jan 2022
Writeup from MB 111:

Northwest Africa 14620 (NWA 14620)


Purchased: 2012

Classification: Ordinary chondrite (H5)

History: Sample was purchased from A. Aaronson at the Tucson mineral show who acquired it from Morocco. Sample is catalogued at the Royal Ontario Museum as M57521.

Physical characteristics: Brown, weathered individual with 20% fusion crust and mostly broken surfaces, showing fractures and spallation of rusty layers. Magnetic susceptibility measured on a 12.37 g endpiece is log χ (× 10-9 m3/kg) = 5.04.

Petrography: A cut surface (8 cm2) reveals a tan colored chondritic meteorite with abundant metal in distributed, sub-mm grains. A corner 2 cm2 portion of the meteorite consists of a darker, metal-poor region. In polished thin section, Fe-oxide weathering products are dominant, staining silicates. Abundant small chondules and chondrule fragments occur in a recrystallized matrix. Olivine typically exhibits undulatory extinction, but no planar fractures. In reflected light, 300 - 500 ┬Ám metal and sulfide grains occur with embayment textures on chondrule and matrix silicates. Metal commonly has Fe-oxide rims, and Fe-oxides line vugs and define crosscutting veins through the stone. The darker, metal-poor region is represented in thin section by a transition to more intense Fe-oxide replacement of metal, Fe oxide replacement of pitted sulfide grains and an increased network of Fe-oxide veins. Chondrules, chondrule fragments and matrix otherwise appears to be similar to these silicates elsewhere in the meteorite.

Classification: Ordinary chondrite: H5 (S2) W3. Petrographic observations and magnetic susceptibility indicate this meteorite is an H5 chondrite. The darker, metal poor region appears to represent more intense terrestrial weathering of metal and sulfides and not a separate lithology.

Specimens: Type specimen ROM; main mass Gregory

Data from:
  Table 0
  Line 0:
Place of purchase:Tucson, USA
Date:P 2012
Mass (g):138.95
Shock stage:S2
Weathering grade:W3
Magnetic suscept.:5.04
Classifier:P. McCausland (ROM, UWO), V Di Cecco (ROM)
Type spec mass (g):25.84
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 1903 approved meteorites from Morocco (plus 27 unapproved names) (plus 1 impact crater)

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