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Northwest Africa 14789
Basic information Name: Northwest Africa 14789
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 14789
Observed fall: No
Year found: 2012
Country: Morocco
Mass:help 1195 g
Classification
  history:
Recommended:  LL5    [explanation]

This is 1 of 3187 approved meteorites (plus 1 unapproved name) classified as LL5.   [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 14789 (NWA 14789)

Morocco

Purchased: 2012

Classification: Ordinary chondrite (LL5)

History: Sample was purchased in 2012 from Adam Aaronson at the Tucson mineral show who acquired it from Morocco. Sample is catalogued at ROM as M58211.

Physical characteristics: Fist-sized individual with smoothly curved fusion crust on 40% of surface, a regmalypted fusion crust surface (20%) and broken surfaces (40%). All surfaces show mature desert polish. Tan-weathered broken surfaces show mm-sized chondrules and chondrule sockets. Physical properties: Magnetic susceptibility measured for a 6.49 g sample is log χ (× 10-9 m3/kg) = 3.57.

Petrography: Cut faces totalling 13 cm2 show a grey-green chondrule-bearing brecciated rock laced with irregular dark veins and patches. The chondrite contains finely disseminated metal grains and some >mm metal and sulfide composite grains. The polished thin section consists of chondritic rock cut extensively by dark fragmental groundmass veins, which contain angular irregular clasts of the host chondrite. Vein contacts are sharp. The host chondrite shows extensive fracture development, containing poorly delineated chondrules and chondrule fragments. Olivine and pyroxene grains show planar fractures and undulatory to mosaic extinction. Fe oxide staining of silicates is limited to haloes surrounding iron-sulfide composite grains and reddening of the dark groundmass material. In BSE images, groundmass vein material contains abundant very fine μm grains of metal and sulfide.

Geochemistry: EPMA: Olivine Fa30.20±0.61 (n=30); Ca-poor pyroxene Fs24.34±1.66Wo2.63±1.07 (n=22); Ca-rich pyroxene Wo40.86±2.31Fs11.90±1.40 (n=7).

Classification: Ordinary chondrite: LL5 (S4) W1. EPMA olivine and pyroxene Fe rich compositions and low magnetic susceptibility indicate LL chondrite. The meteorite has an extensive shock vein network of dark, fragmental groundmass material.

Specimens: Type specimen location: ROM. Main mass: DGregory.

Data from:
  MB111
  Table 0
  Line 0:
Place of purchase:Tucson, AZ, USA
Date:P 2012
Mass (g):1195
Pieces:1
Class:LL5
Shock stage:S4
Weathering grade:W1
Fayalite (mol%):30.20±0.61
Ferrosilite (mol%):24.34±1.66
Wollastonite (mol%):2.63±1.07
Magnetic suscept.:3.57
Classifier:P. McCausland, ROM, UWO
Type spec mass (g):22.60
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)
Find references in NASA ADS:
Find references in Google Scholar:
Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 1902 approved meteorites from Morocco (plus 27 unapproved names) (plus 1 impact crater)

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