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El Médano 056
Basic information Name: El Médano 056
     This is an OFFICIAL meteorite name.
Abbreviation: EM 056
Observed fall: No
Year found: 2011
Country: Chile
Mass:help 180 g
Classification
  history:
Meteoritical Bulletin:  MB 101  (2013)  CK5
Recommended:  CK5    [explanation]

This is 1 of 131 approved meteorites classified as CK5.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (equilibrated), CK chondrites, CK chondrites (type 4-6), and CV-CK clan chondrites
Comments: Approved 23 Oct 2012
Writeuphelp
Writeup from MB 101:

El Médano 056        24°51’S, 70°32’W

Antofagasta, Chile

Found: 2011 Apr 6

Classification: Carbonaceous chondrite (CK5)

History: A single stone was found on a deflation surface in the Atacama desert, Chile, by Rodrigo Martinez in April 2011.

Physical characteristics: A single stone of 180 g entirely covered by matte fusion crust. The interior has a black color.

Petrography: (J. Gattacceca, CEREGE) Recrystallized texture with chondrules. Abundant olivine, pyroxene, plagioclase. Opaque phases are mainly magnetite and sulfides.

Geochemistry: Olivine and pyroxene are equilibrated. Olivine Fa30±1.1 has low MnO content (mean FeO/MnO=103). low-Ca pyroxene Fs24.9±0.1, Wo0.7±0.1, Ca-pyroxene Fs10.8Wo44.4. All silicates contain NiO: olivine mean NiO 0.77 wt.%, low Ca-pyroxene mean NiO 0.17 wt.%, Ca-pyroxene mean NiO 0.55 wt.%. Magnetite Cr2O3=3.9 wt%, Al2O3=0.48wt%, NiO=0.22 wt%. Magnetic susceptibility log χ = 4.51 (χ in 10-9 m3/kg).

Classification: Carbonaceous chondrite (CK5). Low degree of weathering.

Specimens: 20 g and one polished section on deposit at CEREGE. Main mass with MMC.

Data from:
  MB101
  Table 0
  Line 0:
State/Prov/County:Antofagasta
Origin or pseudonym:deflation surface
Date:2011 Apr 6
Latitude:24°51'S
Longitude:70°32'W
Mass (g):180
Pieces:1
Class:CK5
Fayalite (mol%):30.0±1.1
Ferrosilite (mol%):24.9±0.8
Wollastonite (mol%):0.7±0.1
Magnetic suscept.:4.51
Classifier:J. Gattacceca, CEREGE
Type spec mass (g):20
Type spec location:CEREGE
Main mass:MMC
Finder:Rodrigo Martinez
Comments:Submitted by J. Gattacceca
Institutions
   and collections
CEREGE: CEREGE BP 80 Avenue Philibert, Europole de l'Arbois 13545 Aix-en-Provence Cedex 4 France, France (institutional address; updated 9 Mar 2016)
MMC: Museo del Meteorito, Tocopilla 401, San Pedro de Atacama, Chile. or Alonso de Ercilla 1250, La Herradura, Coquimbo, Chile, Chile; Website (institutional address; updated 11 Mar 2014)
Catalogs:
References: Published in Meteoritical Bulletin, no. 101, MAPS 50, 1661, September 2015
Find references in NASA ADS:
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Geography:

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

Statistics:
     This is 1 of 909 approved meteorites from Antofagasta, Chile (plus 1 impact crater)
     This is 1 of 934 approved meteorites from Chile (plus 9 unapproved names) (plus 1 impact crater)
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