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El Médano 444
Basic information Name: El Médano 444
     This is an OFFICIAL meteorite name.
Abbreviation: EM 444
Observed fall: No
Year found: 2017
Country: Chile
Mass:help 167 g
Recommended:  EL6    [explanation]

This is 1 of 120 approved meteorites classified as EL6.   [show all]
Search for other: EL chondrites, Enstatite chondrites, Enstatite chondrites (type 4-7), and Enstatite-rich meteorites
Comments: Approved 9 Feb 2020
Writeup from MB 109:

El Médano 444 (EM 444)        24°44.75’S, 70°21.49’ W

Antofagasta, Chile

Find: 14 Nov. 2017

Classification: Enstatite chondrite (EL6)

Petrography (E. Jacquet, B. Doisneau, MNHNP): The meteorite shows a granular texture of enstatite (58 vol%), plagioclase (11 vol%), silica (2 vol%), with no olivine, with irregularly shaped (few 100 µm) grains of Fe-Ni metal (24 vol%) associated with subordinate (<1 vol%) schreibersite, troilite, daubreelite (as exsolution lamellae in the former) and rare alabandite. Some trails of micron-sized metal and sulfide occur within silicates. Locally, metal may form symplectic intergrowths with plagioclase (10s of µm). Graphite grains (4 vol%), sometimes euhedral, often in sheaves showing pressure lamellae such as Fig. 4 of Ramdohr (1963), up to 1 mm occur mostly associated with the metal. Only one relict radial pyroxene chondrule was recognized in the section studied.

Geochemistry: Enstatite Fs0.39±0.15Wo1.53±0.07 (N=16); plagioclase An16.1±0.3Ab80.1±0.4Or3.7±0.4 (N=9); silica 1.3±0.5 wt% Al2O3, 0.6±0.3 wt% FeO (N=9); Fe,Ni metal 5.8±0.4 wt% Ni, 1.1±0.05 wt% Si (N=32); troilite 0.45±0.05 wt% Ti, 0.87±0.11 wt% Cr (N=9).

Classification: Enstatite chondrite (EL6). Chondritic nature is indicated by the abundance of metal and tentative evidence of relict chondrules. The reduced mineralogy, and in particular the presence of alabandite and the Si content of kamacite, indicates affiliation to EL, with the abundance of metal on the high end of the range. A petrographic type 6 despite the paucity of chondrules seems consistent with enstatite chondrite usage.

Specimens: 135 g with MNHNP (type specimen), 32 g at CEREGE.

Data from:
  Table 0
  Line 0:
Date:14 Nov. 2017
Longitude:70°21.49' W
Mass (g):167
Weathering grade:W2
Ferrosilite (mol%):0.39 ± 0.15 (N=16)
Wollastonite (mol%):1.53 ± 0.07 (N=16)
Magnetic suscept.:5.24
Classifier:E. Jacquet, B. Doisneau, MNHNP
Type spec mass (g):135
Type spec location:MNHNP
Main mass:MNHNP
Finder:J. Gattacceca
Comments:Field name JG67; submitted by E. Jacquet
   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)
MNHNP: Museum National d'Histoire Naturelle, IMPMC-CP52, 57 rue Cuvier, 75005 Paris, France, France; Website (institutional address)
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
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     Recommended::   (24° 44' 45"S, 70° 21' 29"W)

     This is 1 of 1705 approved meteorites from Antofagasta, Chile (plus 5 unapproved names) (plus 1 impact crater)
     This is 1 of 1733 approved meteorites from Chile (plus 11 unapproved names) (plus 1 impact crater)
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