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El Médano 497
Basic information Name: El Médano 497
     This is an OFFICIAL meteorite name.
Abbreviation: EM 497
Observed fall: No
Year found: 2019
Country: Chile
Mass:help 38.8 g
Classification
  history:
Recommended:  H4    [explanation]

This is 1 of 6407 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 19 Mar 2022
Writeuphelp
Writeup from MB 111:

El Médano 497 (EM 497)        24°44.344’S, 70°21.409’W

Antofagasta, Chile

Find: 2019 Nov 22

Classification: Ordinary chondrite (H4)

History: While searching for meteorites, Vincent Stelluti recovered this stone on a slope of about 4% and composed of gravel, stones and sand. The stone was deposited on the surface of the ground

Physical characteristics: A 33.8 g brown stone has roughly prismatic shape; the three sides exposed to the wind are smooth and the side touching the ground is rough. One cannot distinguish any fusion crust on its surface. Physical properties: Bulk density: 3.44±0.03 g/cm3; magnetic susceptibility log χ (× 10-9 m3/kg) = 5.01.

Petrography: Chondrules are well defined, set in a finely recrystallized matrix. Chondrule mesostases are finely recystallized. Silicates show pervasive Fe-staining. Chondrules and individual grains in the matrix have fine-grained rims of matrix material. Olivine displays straight to undulatory extinction. Metal is abundant in the section, occuring primarily in the matrix as isolated sub-mm grains.

Geochemistry: EPMA: olivine Fa19.14±0.21 (n=11); Ca-poor pyroxene Fs17.00±0.62Wo1.32±0.26 (n=11)

Classification: Ordinary chondrite: H4 (S1) W2

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

Data from:
  MB111
  Table 0
  Line 0:
State/Prov/County:Antofagasta
Origin or pseudonym:deflation surface
Date:2019 Nov 22
Latitude:24°44.344'S
Longitude:70°21.409'W
Mass (g):38.8
Pieces:1
Class:H4
Shock stage:S1
Weathering grade:W2
Fayalite (mol%):19.14±0.21 (N=11)
Ferrosilite (mol%):17.00±0.62 (N=11)
Wollastonite (mol%):1.32±0.26
Magnetic suscept.:5.01
Classifier:P. McCausland, A McNeil (UWO)
Type spec mass (g):8.80
Type spec location:UWO
Main mass:Vincent Stelluti
Finder:Vincent Stelluti
Comments:Field Name: VS06; submitted by P. McCausland
Institutions
   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)
Catalogs:
References: Published in Meteoritical Bulletin, no. 111, in preparation (2022)
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Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Stelvino   
Geography:

Chile
Coordinates:
     Recommended::   (24° 44' 21"S, 70° 21' 25"W)

Statistics:
     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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