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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
Classification
  history:
Meteoritical Bulletin:  MB 111  (2023)  H5
Recommended:  H5    [explanation]

This is 1 of 11505 approved meteorites (plus 23 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
Writeuphelp
Writeup from MB 111:

Northwest Africa 14620 (NWA 14620)

Morocco

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 µm 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:
  MB111
  Table 0
  Line 0:
Place of purchase:Tucson, USA
Date:P 2012
Mass (g):138.95
Pieces:1
Class:H5
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
Institutions
   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)
Catalogs:
References: Published in Gattacceca J., McCubbin F. M., Grossman J. N., Schrader D. L., Chabot N. L., D’Orazio M., Goodrich C., Greshake A., Gross J., Joy K. H., Komatsu M. and Miao B. (2023) The Meteoritical Bulletin, No. 111. Meteoritics & Planetary Science 58, 901–904. ?
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Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 2068 approved meteorites from Morocco (plus 31 unapproved names) (plus 1 impact crater)
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Revision
  history:
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