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El Médano 262
Basic information Name: El Médano 262
     This is an OFFICIAL meteorite name.
Abbreviation: EM 262
Observed fall: No
Year found: 2015
Country: Chile
Mass:help 26 kg
Classification
  history:
Meteoritical Bulletin:  MB 104  (2015)  CO3
Recommended:  CO3    [explanation]

This is 1 of 526 approved meteorites classified as CO3.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CM-CO clan chondrites, and CO chondrites
Comments: Approved 30 Jun 2015
Writeuphelp
Writeup from MB 104:

El Médano 262        ~24°51’S, ~70°32’W

Antofagasta, Chile

Find: 2015 Jan 5

Classification: Carbonaceous chondrite (CO3)

History: The stones were found in the Atacama desert by E. Christensen while looking for meteorites

Physical characteristics: Dark brownish irregular stones without fusion crust. Cut surface reveals a dark brown interior with abundant small chondrules.

Petrography: (J. Gattacceca, CEREGE) Abundant chondrules (predominantly of type I) and CAIs in a fine-grained Fe rich matrix. Chondrule:matrix ratio is 57:43. Average chondrule apparent size 180±120 μm (N=24).

Geochemistry: Olivine in the range Fa0.5-52.9 (mean Fa19.3±16.6, PMD=73%, N=18). Cr2O3 in ferroan olivine 0.08±0.05 wt.% (N=15). Low-Ca pyroxene Fs2.3±1.2 Wo1.5±0.8 (N=10). Magnetic susceptibility log χ =4.41 (χ in 10-9 m3/kg).

Classification: Carbonaceous chondrite (CO3). Minimal weathering

Specimens: 52 g at CEREGE. Main mass with Eric Christensen.

Data from:
  MB104
  Table 0
  Line 0:
State/Prov/County:Antofagasta
Origin or pseudonym:deflation surface
Date:2015 Jan 5
Latitude:~24°51'S
Longitude:~70°32'W
Mass (g):26000
Pieces:>20
Class:CO3
Weathering grade:minimal
Fayalite (mol%):19.3±16.6 (PMD=73%, N=18)
Ferrosilite (mol%):2.3±1.2 (N=10)
Wollastonite (mol%):1.5±0.8
Magnetic suscept.:4.41
Classifier:J. Gattacceca, H. Pourkhorsandi, CEREGE
Type spec mass (g):52
Type spec location:CEREGE
Main mass:Eric Christensen
Finder:Eric Christensen
Comments:Submitted by J. Gattacceca
Institutions
   and collections
CEREGE: CEREGE BP 80 Avenue Philibert, Technopole de l'Arbois 13545 Aix-en-Provence Cedex 4 France, France (institutional address; updated 29 Oct 2018)
Catalogs:
References: Published in Meteoritical Bulletin, no. 104, MAPS 52, 2284, Octover 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12930/full
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Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Michael Warner   
Geography:

Chile
Coordinates:
     Recommended::   (24° 51'S, 70° 32'W)

Statistics:
     This is 1 of 1453 approved meteorites from Antofagasta, Chile (plus 4 unapproved names) (plus 1 impact crater)
     This is 1 of 1480 approved meteorites from Chile (plus 10 unapproved names) (plus 1 impact crater)
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