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El Médano 395
Basic information Name: El Médano 395
     This is an OFFICIAL meteorite name.
Abbreviation: EM 395
Observed fall: No
Year found: 2018
Country: Chile
Mass:help 2.29 kg
Classification
  history:
Recommended:  Brachinite    [explanation]

This is 1 of 45 approved meteorites classified as Brachinite.   [show all]
Search for other: Brachinites, Primitive achondrites
Comments: Approved 9 Feb 2019
Writeuphelp
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:
State/Prov/County:Antofagasta
Date:November 2018
Latitude:24°53'S
Longitude:70°23'W
Mass (g):2288
Pieces:1
Class:Brachinite
Shock stage:low
Weathering grade:moderate
Fayalite (mol%):33.3±0.4
Ferrosilite (mol%):8.0±0.5
Wollastonite (mol%):46.8±0.8
Magnetic suscept.:3.24
Classifier:A. Love, App
Type spec mass (g):20.45
Type spec location:App
Main mass:Steve Arnold
Finder:Steve Arnold
Comments:Submitted by Anthony Love
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)
Catalogs:
References: Published in Meteoritical Bulletin, no. 108, in preparation (2019)
Find references in NASA ADS:
Find references in Google Scholar:
Geography:

Chile
Coordinates:
     Recommended::   (24° 53'S, 70° 23'W)

Statistics:
     This is 1 of 1387 approved meteorites from Antofagasta, Chile (plus 2 unapproved names) (plus 1 impact crater)
     This is 1 of 1414 approved meteorites from Chile (plus 8 unapproved names) (plus 1 impact crater)
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