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Northwest Africa 14628
Basic information Name: Northwest Africa 14628
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 14628
Observed fall: No
Year found: 2012
Country: Morocco
Mass:help 257 g
Recommended:  H4-6    [explanation]

This is 1 of 101 approved meteorites classified as H4-6.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 19 Mar 2022
Writeup from MB 111:

Northwest Africa 14628 (NWA 14628)


Purchased: 2012

Classification: Ordinary chondrite (H4-6)

History: Sample was purchased at the Tucson mineral show in 2012 from A. Aaronson, who acquired it from Morocco. Sample is catalogued at the ROM as M58156.

Physical characteristics: Oriented, blocky fist-sized individual with brown fusion crust on three regmalypted sides that bear well-developed flow lines. The remaining 50% of the surface consists of three rusty weathered broken faces. A light desert varnish is developed on all surfaces. Magnetic susceptibility measured for a 2.90 g offcut piece is log χ (× 10-9 m3/kg) = 5.35.

Petrography: A 10 cm2 cut surface shows a rusty weathered chondritic breccia, consisting of subrounded lighter color lithic type 6 clasts up to 2 cm size set in a dark type 4 groundmass. Abundant metal is present in clasts and groundmass, in blebs up to 5 mm size. In polished thin section, several lithic clasts show discernable small chondrules and chondrule fragments in a recrystallized matrix. The lithic clasts as well as individual chondrules and chondrule fragments typically have fine grained rims of groundmass material. Chondrules in the groudmass typically have microcrystalline mesostasis. Olivine and pyroxene grains show undulatory to mosaic extinction. In reflected light, sulfide grains are well distributed in the groundmass, showing a spongy texture. In clasts, sulfide aggregates are typically larger, at 100 - 300 µm. Metal grains in clasts range from 50 - 600 µm, with embayed textures on the host silicates.

Classification: Ordinary chondrite: H4-6 (S4) W1. Petrographic observations and magnetic susceptibility indicate this meteorite is an H chondrite breccia.

Specimens: Type specimen ROM; main mass Gregory

Data from:
  Table 0
  Line 0:
Place of purchase:Tucson, USA
Date:P 2012
Mass (g):257.42
Shock stage:S4
Weathering grade:W1
Magnetic suscept.:5.39
Classifier:P. McCausland (ROM, UWO), V Di Cecco (ROM)
Type spec mass (g):25.49
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 1902 approved meteorites from Morocco (plus 27 unapproved names) (plus 1 impact crater)

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