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| El Médano 444 | |||||||||||||||||||||||||||||||||||
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| Basic information | Name: El Médano 444 This is an OFFICIAL meteorite name. Abbreviation: EM 444 Observed fall: No Year found: 2017 Country: Chile Mass:  167 g | ||||||||||||||||||||||||||||||||||
| Classification history: |
This is 1 of 133 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 |
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: MB109 Table 0 Line 0: |
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| Institutions and collections |
CEREGE: CEREGE
BP 80
Avenue Philibert, Technopole de l'Arbois
13545 Aix-en-Provence Cedex 4
France, France (institutional address; updated 10 Jun 2023) MNHNP: Museum National d'Histoire Naturelle, IMPMC-CP52, 57 rue Cuvier, 75005 Paris, France, France; Website (institutional address) |
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| Catalogs: |
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| References: | Published in Meteoritical Bulletin, no. 109, in preparation (2020)
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Geography:
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Statistics: This is 1 of 3440 approved meteorites from Antofagasta, Chile (plus 12 unapproved names) (plus 1 impact crater) This is 1 of 3469 approved meteorites from Chile (plus 13 unapproved names) (plus 1 impact crater) | ||||||||||||||||||||||||||||||||||
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| Revision history: |
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