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El Médano 301
Basic information Name: El Médano 301
     This is an OFFICIAL meteorite name.
Abbreviation: EM 301
Observed fall: No
Year found: 2013
Country: Chile
Mass:help 17.9 g
Classification
  history:
Meteoritical Bulletin:  MB 105  (2016)  Chondrite-ung
Recommended:  Chondrite-ung    [explanation]

This is 1 of 24 approved meteorites classified as Chondrite-ung.   [show all]
Search for other: Ungrouped chondrites
Comments: Approved 26 Mar 2016
Writeuphelp
Writeup from MB 105:

El Médano 301        ~24°51’S, ~70°32’W

Antofagasta, Chile

Find: 2013 Nov 09

Classification: Ungrouped chondrite

History: Two stones were found 1 m apart in the Atacama desert by Pierre Rochette on November 4, 2013.

Physical characteristics: A single brown stone without fusion crust

Petrography: Closely packed, well-defined chondrules with average apparent diameter 490±330 μm (N=60). Main minerals are olivine (forsterite), enstatite, diopside, chlorapatite, chromite, troilite, kamacite, taenite. Metal and sulfides have been extensively replaced by weathering products.

Geochemistry: Olivine Fa3.9±0.4 (Fa3.6-5.0, PMD 5.5%, FeO/MnO=8.0±1.3, N=10), Cr2O3 0.02±0.03 wt%. Orthopyroxene Fs13.1±5.7 (Fs6.6-21.0, PMD=40%, N=11). Oxygen isotopic composition (J. Gattacceca, C. Sonzogni, CEREGE) is δ17O = 3.58 ‰, δ18O = 5.38 ‰, Δ17O = 0.78‰ (analysis of one 1.5 mg sample of hand-picked separated silicates after acid cleaning). Magnetic susceptiblity log χ (× 10-9 m3/kg)=4.62.

Classification: Chondrite-ung. With Fa3.6-5.0, this meteorite has affinities with NWA 7135 that has Fa4.8-6.3 and similar oxygen isotope composition, although NWA 7135 is more reduced, with occurrence of schreibersite and oldhamite.

Specimens: Polished section, main mass and type specimen at CEREGE

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):17.9
Pieces:2
Class:Chondrite-ung
Weathering grade:W4
Fayalite (mol%):3.9±0.4 (N=10)
Ferrosilite (mol%):13.1±5.7 (N=11)
Wollastonite (mol%):0.9±0.4 (N=11)
Magnetic suscept.:4.62
Classifier:J. Gattacceca, H. Pourkhorsandi, B. Devouard
Type spec mass (g):10
Type spec location:CEREGE
Main mass:CEREGE
Finder:Pierre Rochette
Comments:Submitted by J. Gattacceca
Plots: O isotopes:  
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. 105, MAPS 52, 2411, September 2017. http://onlinelibrary.wiley.com/doi/10.1111/maps.12944/full
Find references in NASA ADS:
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Geography:

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

Statistics:
     This is 1 of 1387 approved meteorites from Antofagasta, Chile (plus 5 unapproved names) (plus 1 impact crater)
     This is 1 of 1414 approved meteorites from Chile (plus 11 unapproved names) (plus 1 impact crater)
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