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Northwest Africa 14791
Basic information Name: Northwest Africa 14791
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 14791
Observed fall: No
Year found: 2015
Country: Morocco
Mass:help 278 g
Classification
  history:
Meteoritical Bulletin:  MB 111  (2023)  LL4-6
Recommended:  LL4-6    [explanation]

This is 1 of 83 approved meteorites classified as LL4-6.   [show all]
Search for other: LL chondrites, LL chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 26 Mar 2022
Writeuphelp
Writeup from MB 111:

Northwest Africa 14791 (NWA 14791)

Morocco

Purchased: 2015

Classification: Ordinary chondrite (LL4-6)

History: Sample was purchased in 2015 from A. Aaronson at the Tucson mineral show who acquired it from Morocco. Sample is catalogued at ROM as M58213.

Physical characteristics: Individual with 60% fusion crust, showing dun colored weathering of broken surfaces as well as dun brown weathering fusion crust indicating that stone was 70% buried at find location. Desert polish well developed on non-weathered fusion crust, along with through-going cracks. Physical properties: Magnetic susceptibility measured for a 22.97 g specimen is log χ (× 10-9 m3/kg) = 3.68.

Petrography: Cut face (14 cm2) reveals a green-brown interior, featuring angular cm clasts in a fragmental breccia. Sub mm-size metal grains are sparsely disseminated in stone. Interpreted buried part of stone shows pervasive development of cracks filled with fine grained dun brown material. A polished thin section shows a breccia, including some light colored chondritic clasts set in a chondrule-bearing groundmass. Chondrules are well delineated, showing microcrystalline mesostases and bearing fine-grained dark rims, set in a slightly recystallized matrix bearing individual euhedral olivine grains and chondrule fragments. Olivine and pyroxene grains typically show undulatory extinction and rarely, mosaicism. Clasts of apparently higher petrographic grade occupy 25% of the section, containing poorly defined chondrules in a recrystallized matrix, with metal and silicates showing simplified grain boundaries. In reflected light, metal typically occurs as isolated grains and as kamacite-taenite-sulfide composite clusters, with Fe oxide rims. Sulfide is abundant, occurring as grains and aggregates up to 1 mm size, commonly partly or nearly completely replaced by Fe oxides.

Geochemistry: EPMA: Olivine Fa28.48±0.60 (n=30); Ca-poor pyroxene Fs20.00±5.51Wo1.54±0.92 (n=24); Ca-rich pyroxene Wo42.06±4.22Fs9.05±0.45 (n=5).

Classification: Ordinary chondrite: LL 4-6 (S3) W3. EPMA average compositions for olivine and pyroxene grains and the variation in pyroxene compositions are consistent with LL4 overall classification. Clasts are of higher petrographic grade up to LL6.

Specimens: Type specimen location: ROM. Main mass: D. Gregory.

Data from:
  MB111
  Table 0
  Line 0:
Place of purchase:Tucson, AZ, USA
Date:P 2015
Mass (g):278.18
Pieces:1
Class:LL4-6
Shock stage:S3
Weathering grade:W3
Fayalite (mol%):28.48±0.60
Ferrosilite (mol%):20.00±5.51
Wollastonite (mol%):1.54±0.92
Magnetic suscept.:3.68
Classifier:P. McCausland, ROM, UWO
Type spec mass (g):28.44
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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