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El Médano 300
Basic information Name: El Médano 300
     This is an OFFICIAL meteorite name.
Abbreviation: EM 300
Observed fall: No
Year found: 2013
Country: Chile
Mass:help 1528 g
Classification
  history:
Meteoritical Bulletin:  MB 105  (2016)  Iron, IAB-ung
Recommended:  Iron, IAB-ung    [explanation]

This is 1 of 56 approved meteorites classified as Iron, IAB-ung.   [show all]
Search for other: IAB complex irons, Iron meteorites, and Metal-rich meteorites
Comments: Approved 3 Feb 2016
Writeuphelp
Writeup from MB 105:

El Médano 300        ~24°51’S, ~70°32’W

Antofagasta, Chile

Find: 2013 Nov 09

Classification: Iron meteorite (IAB, ungrouped)

History: Found by Matthieu Gounelle during a systematic search for meteorites organized by CEREGE in 2013.

Physical characteristics: The meteorite is a full oriented specimen with pyramid shape, regmaglypts and a few weathering pits. Cut surface shows unweathered metallic interior with dark mm-sized inclusions, some organized in flower-like structures.

Petrography: Metal with fine grained (circa 100 μm) homogeneous texture. The meteorite has graphite "flowers" with dimensions up to 5 mm that are quite similar to those in IAB-ungrouped NWA 8154 and NWA 8155. However, the composition of this iron is very different from these two NWA irons. Also present is abundant fine (20 μm) schreibersite, rare troilite globule and schreibersite large crystals (mm size).

Geochemistry: Bulk composition (INAA, J.T. Wasson, UCLA): Co = 5.02 mg/g; Ni = 66.0 mg/g, Ga = 57.6 μg/g, Ge = 307 μg/g, As = 12.3 μg/g, Ir = 1.60 μg/g, Au = 1.608 μg/g. The meteorite has high Sb (280 ng/g). Data are the mean of two analyses. The high Au, As and Sb indicate the this iron is a member of the IAB complex. Its composition is, however, unique. The most similar irons are Redfields, Pedernales and Mundrabilla, but none of these are closely related. It also differs in major ways from NWA 8154 and NWA 8155, which also show graphite flowers; for example, the latter have 133 mg/g Ni and 24 μg/g Ir.

Classification: Iron, IAB-ung

Specimens: Main mass and type specimen in CEREGE, INAA slab (1.47 g) in UCLA, 2.6 g at MNHN.

Data from:
  MB105
  Table 0
  Line 0:
State/Prov/County:Antofagasta
Origin or pseudonym:Deflation surface
Date:2013 Nov 09
Latitude:~24°51'S
Longitude:~70°32'W
Mass (g):1528
Pieces:1
Class:Iron, IAB-ung
Classifier:J. T. Wasson, B. Devouard, P. Rochette
Type spec mass (g):52
Type spec location:CEREGE
Main mass:CEREGE
Finder:Matthieu Gounelle
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)
UCLA: Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA 90095-1567, United States (institutional address; updated 17 Oct 2011)
MNHN: Museum National d'Histoire Naturelle, IMPMC-CP52, 57 rue Cuvier, 75005 Paris, France, France; Website (institutional address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 105, MAPS 52, 2411, September 2017. http://onlinelibrary.wiley.com/doi/10.1111/maps.12944/full
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Photos:
CreditPhotos
Public domain photographs:
Jerome Gattacceca   
Geography:

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

Statistics:
     This is 1 of 1417 approved meteorites from Antofagasta, Chile (plus 5 unapproved names) (plus 1 impact crater)
     This is 1 of 1444 approved meteorites from Chile (plus 11 unapproved names) (plus 1 impact crater)
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