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El Médano 496
Basic information Name: El Médano 496
     This is an OFFICIAL meteorite name.
Abbreviation: EM 496
Observed fall: No
Year found: 2019
Country: Chile
Mass:help 275 g
Recommended:  L5    [explanation]

This is 1 of 8581 approved meteorites (plus 4 unapproved names) classified as L5.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 19 Mar 2022
Writeup from MB 111:

El Médano 496 (EM 496)        24°37.044’S, 70°18.414’W

Antofagasta, Chile

Find: 2019 Nov 20

Classification: Ordinary chondrite (L5)

History: While searching for meteorites, Vincent Stelluti recovered this stone on a slope of about 5% and composed of gravel, stones and sand. The stone was sunk into the ground about 2 cm.

Physical characteristics: A brown to dark brown stone with a roughly conical shape but with part of the cone missing. Fusion crust covers about 60% of the surface, with some regmaglypts and several cracks present. Physical properties: Bulk density: 3.38±0.03 g/cm3; Grain density: 3.35 ± 0.01 g/cm3; porosity zero; magnetic susceptibility log χ (× 10-9 m3/kg) = 4.65.

Petrography: Cut surfaces show metal distributed in blebs and veins of cm length. In polished thin section, chondrules are poorly discernable and matrix is recrystallized; silicates show pervasive Fe-staining. Chondrules are typically fragmented with few complete. Thin dark veins with sharp contacts connect between localized dark patches that appear to be melt pockets in the silicates. Metal occurs interstitially between silicates or in small veins. Olivine shows mosaic extinction and planar fractures.

Geochemistry: EPMA: olivine Fa24.66±0.50 (n=13); Ca-poor pyroxene Fs20.62±0.56Wo1.48±0.40 (n=5); Ca-poor pyroxene Wo44.97±0.84Fs8.01±1.19 (n=3)

Classification: Ordinary chondrite: L5 (S4) W2. Olivine and metal textures, as well as presence of melt pockets and shock veins are consistent with moderate to high shock metamorphism.

Specimens: Type specimen: UWO; Main mass V. Stelluti

Data from:
  Table 0
  Line 0:
Origin or pseudonym:deflation surface
Date:2019 Nov 20
Mass (g):275.1
Shock stage:S4
Weathering grade:W2
Fayalite (mol%):24.66±0.50 (N=13)
Ferrosilite (mol%):20.62±0.56 (N=5)
Wollastonite (mol%):1.48±0.40 (N=5)
Magnetic suscept.:4.65
Classifier:P. McCausland, A McNeil (UWO)
Type spec mass (g):31.73
Type spec location:UWO
Main mass:Vincent Stelluti
Finder:Vincent Stelluti
Comments:Field Name: VS02; sample contains shock veins; submitted by P. McCausland
   and collections
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)
References: Published in Meteoritical Bulletin, no. 111, in preparation (2022)
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Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)

     Recommended::   (24° 37' 3"S, 70° 18' 25"W)

     This is 1 of 2503 approved meteorites from Antofagasta, Chile (plus 10 unapproved names) (plus 1 impact crater)
     This is 1 of 2532 approved meteorites from Chile (plus 16 unapproved names) (plus 1 impact crater)
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