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Northwest Africa 14748
Basic information Name: Northwest Africa 14748
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 14748
Observed fall: No
Year found: 2018
Country: Morocco
Mass:help 143.8 g
Classification
  history:
Recommended:  H4    [explanation]

This is 1 of 6388 approved meteorites (plus 2 unapproved names) classified as H4.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 6 Aug 2022
Writeuphelp
Writeup from MB 111:

Northwest Africa 14748 (NWA 14748)

Morocco

Purchased: 2018

Classification: Ordinary chondrite (H4)

History: Sample was purchased at Tucson Mineral show in 2018 from A. Aaronson, who acquired it from Morocco. Sample is catalogued at ROM as M59717.

Physical characteristics: Irregular dark brown stone lacking fusion crust with mature desert polish on most broken surfaces. Some chondrules stand out in relief on pitted broken surfaces. Magnetic susceptibilty of a 19.93 g specimen is log χ (× 10-9 m3/kg) = 4.74.

Petrography: Cut surfaces reveal a dark interior with visible porosity, bearing abundant small, well-defined chondrules and sparse metal grains. A 9 mm diameter white megachondrule has no porosity and a dark rim. In polished thin section numerous chondules of dominantly POP, PO and RP types, as well as chondrule fragments, individual grains and some AOA are set in a dark matrix. Chondrule diameters average 464±168 μm (n=67). Chondrule mesostasis is dark and microcrystalline. Olivine and pyroxene show sharp to undulatory extinction. The megachondrule consists of microcrystalline barred olivine with a rim of granular olivine crystals. Fe staining of silicates is pervasive throughout section. In reflected light and BSE images, significant porosity (7 vol%) is evident, down to μm scale pitting of pyroxene and mesostasis. There is pervasive thin Fe-oxide coating of irregular pore spaces and cracks, and sparse metal grains are surrounded by Fe oxides. Compositional zoning of Ca-poor pyroxene is common in many chondrules. A Ca-poor pyroxene chondrule fragment contains minute metal inclusions and poikiolitically included SiO2.

Geochemistry: EPMA: olivine Fa18.16±0.60 (n=29); Ca-poor pyroxene Fs14.88±7.50Wo1.13±1.22 (n=26); Ca-rich pyroxene Fs8.89±4.57Wo36.11±7.37 (n=6)

Classification: Ordinary chondrite: H4 (S2) W4. Chondrule average diameter of 464±168 µm (n=67) and EPMA olivine Fa18.16; Ca-poor pyroxene Fs14.88 indicate an H chondrite. High porosity, pitted appearance, extensive weathering of metal and sulfide suggests moderate to high weathering. Magnetic susceptibility is consistent with a weathered H chondrite.

Specimens: Type specimen ROM; main mass DGregory

Data from:
  MB111
  Table 0
  Line 0:
Place of purchase:Tucson, USA
Date:P 2018
Mass (g):143.76
Pieces:1
Class:H4
Shock stage:S2
Weathering grade:W4
Fayalite (mol%):18.16±0.60
Ferrosilite (mol%):14.88±7.50, 8.89±4.57
Wollastonite (mol%):1.13±1.22, 36.11±7.37
Magnetic suscept.:4.74
Classifier:P. McCausland (ROM, UWO), V Di Cecco (ROM)
Type spec mass (g):22.89
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 Meteoritical Bulletin, no. 111, in preparation (2022)
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Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 1903 approved meteorites from Morocco (plus 27 unapproved names) (plus 1 impact crater)

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