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| El Médano 395 | |||||||||||||||||||||||||||||||||||||||
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| Basic information | Name: El Médano 395 This is an OFFICIAL meteorite name. Abbreviation: EM 395 Observed fall: No Year found: 2018 Country: Chile Mass:  2.29 kg | ||||||||||||||||||||||||||||||||||||||
| Classification history: |
This is 1 of 62 approved meteorites classified as Brachinite. [show all] Search for other: Brachinites, Primitive achondrites | ||||||||||||||||||||||||||||||||||||||
| Comments: | Approved 9 Feb 2019 | ||||||||||||||||||||||||||||||||||||||
| Writeup |
Writeup from MB 108:
El Médano 395 (EM 395) 24°53’S, 70°23’W Antofagasta, Chile Find: November 2018 Classification: Primitive achondrite (Brachinite) History: A single 2288 g stone was recovered near the top of a large hill from the desert pavement by Steve Arnold in November 2018 on a meteorite hunting expedition in the El Médano region of the Atacama Desert. Physical characteristics: The sample is dark brownish-orange in color, has a tabular shape and covered by a weathered patina. A cut face shows the interior is composed of dark-reddish interlocking crystals. Petrography: Description and classification (A. Love, App): Sample displays a protogranular xenomorphic texture composed of 300-2500 µm olivine (93 vol%) and diopside (5.5 vol%), oxidized Fe metal, chromite (0.64 vol%), sulfide (0.25 vol%) and plagioclase (0.57 vol%). Diopside has irregularly shaped grain boundaries. Geochemistry: (A.Love, App) Olivine: Fa33.3±0.4, Fe/Mn=71.6, Mg#67, CaO=0.1Wt%, N=16; High-Ca pyroxene: Fs8.0±0.5Wo46.8±0.8 Fe/Mn=47.2, Mg#85, N=10; Plag: An47.3Or0.0; Cr-Spinel: Cr#66, Mg#26, Fe/Mn=61.7. Oxygen isotopes (K. Ziegler, UNM): analyses of 3 acid-washed subsamples by laser fluorination gave, respectively, δ17O = 2.170, 2.020, 2.329 ; δ18O =4.582, 4.290, 4.897 ; Δ17O = -0.250, -0.245, -0.256 (all per mil). Oxygen isotopes are depleted in 17O and plot in the region below the TFL. Classification: Textures, mineral compositions, oxygen isotopes and magnetic susceptibility suggest this is a brachinite. Specimens: Steve Arnold holds the main mass. One slice weighing 20.45 g and a polished thin section and mount are on deposit at App. | ||||||||||||||||||||||||||||||||||||||
| Data from: MB108 Table 0 Line 0: |
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| Plots: | O isotopes: | ||||||||||||||||||||||||||||||||||||||
| Institutions and collections |
UNM: Institute of Meteoritics
MSC03 2050
University of New Mexico
Albuquerque NM 87131-1126
USA, United States; Website (institutional address; updated 12 Feb 2015) App: Department of Geology, 572 Rivers St., Appalachian State University, Boone, NC 28608, United States (institutional address; updated 7 Mar 2013) |
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| Catalogs: |
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| References: | Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
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Geography:
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Statistics: This is 1 of 3632 approved meteorites from Antofagasta, Chile (plus 12 unapproved names) (plus 1 impact crater) This is 1 of 3661 approved meteorites from Chile (plus 13 unapproved names) (plus 1 impact crater) | ||||||||||||||||||||||||||||||||||||||
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