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El Médano 499
Basic information Name: El Médano 499
     This is an OFFICIAL meteorite name.
Abbreviation: EM 499
Observed fall: No
Year found: 2019
Country: Chile
Mass:help 203 g
Recommended:  L5-6    [explanation]

This is 1 of 64 approved meteorites classified as L5-6.   [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 499 (EM 499)        24°44.607’S, 70°21.165’W

Antofagasta, Chile

Find: 2019 Nov 23

Classification: Ordinary chondrite (L5-6)

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

Physical characteristics: A 202.6 g individual with six very unequal faces; four of the faces are relatively smooth and retain a very eroded dark brown fusion crust. Two other faces are broken and rough with a few throughgoing cracks; all faces have mature desert polish. Physical properties: Bulk density: 3.38±0.03; Grain density: 3.38±0.01; porosity zero; magnetic susceptibility log χ (× 10-9 m3/kg) = 4.43.

Petrography: Cut faces show a brown weathered matrix, with dispersed metal grains, in a bulk rock that has dark veins separating blocks of chondritic meteorite. In thin section, local sharp dark veins cut across chondrules, and dark, arcuate veins subdivide the chondritic rock into sub-cm blocks, including one which appears to be of higher grade. Olivine shows undulatory extinction. Chondrules can be discerned but matrix is recrystallized.

Geochemistry: EPMA: olivine Fa25.40±0.50 (n=15); Ca-poor pyroxene Fs21.07±0.09Wo1.34±0.23 (n=8)

Classification: Ordinary chondrite: L5-6 (S3) W2. Sparse metal and chondrules with moderate to poor definition in a recystallized matix suggests L5. Olivine EPMA limited range of compositions is consistent with L5. Clasts are of higher grade L6.

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

Data from:
  Table 0
  Line 0:
Origin or pseudonym:deflation surface
Date:2019 Nov 23
Mass (g):202.6
Shock stage:S3
Weathering grade:W2
Fayalite (mol%):25.40±0.50 (N-15)
Ferrosilite (mol%):21.07±0.09 (N=8)
Wollastonite (mol%):1.34±0.23
Magnetic suscept.:4.43
Classifier:P. McCausland, A McNeil (UWO)
Type spec mass (g):38.22
Type spec location:UWO
Main mass:Vincent Stelluti
Finder:Vincent Stelluti
Comments:Field Name: VS09; stone contains arcuate 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° 44' 36"S, 70° 21' 10"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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