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Erg Atouila 002
Basic information Name: Erg Atouila 002
     This is an OFFICIAL meteorite name.
Abbreviation: EA 002
Observed fall: No
Year found: 2020
Country: Mali
Mass:help 5 kg
Classification
  history:
Recommended:  Diogenite    [explanation]

This is 1 of 505 approved meteorites classified as Diogenite.   [show all]
Search for other: Achondrites, Diogenites, and HED achondrites
Comments: Approved 25 May 2022
Writeuphelp
Writeup from MB 111:

Erg Atouila 002 (EA 002)        22º14.6184’N, 5º59.6502’W

Gao, Mali

Purchased: 2020

Classification: HED achondrite (Diogenite)

History: A large number of pieces of different sizes, ranging from a few grams to the main masses of 1370, 561, and 535 g, were found in a region (see coordinates) 214 km SW of Taoudenni, Mali in Oct. and Nov 2020. Adrián Contreras Gómez (CRATER meteorites) purchased the samples from a meteorite dealer in Mauritania in July 2021.

Physical characteristics: Sample has an ovoid shape and is yellowish orange in color. A small patch of black fusion crust covers a portion of the sample. Other areas show orange staining from oxidation.

Petrography: Description and classification (A. Love, App) Sample is an aggregate of fractured, 250-1024 µm orthopyroxene grains. Orthopyroxenes contain exsolved Cpx inclusions. Additional minerals are: chromite, Si polymorphs, FeS and rare Ni-free iron metal. Breccia composed of coarse-grained lithic clasts and fine polycrystalline clasts of orthopyroxene. Silicates show blebs of FeS. Additional minerals are: chromite and troilite. polymorphs, FeS and rare Ni-free iron metal. Breccia composed of coarse-grained lithic clasts and fine polycrystalline clasts of orthopyroxene. Silicates show blebs of FeS. Additional minerals are: chromite and troilite.

Geochemistry: (A. Love, App) low Ca pyroxene Fs24.7±0.1Wo1.9±0.0, Fe/Mn=26.7±0.9, n=10

Classification: HED achondrite (diogenite) Texture, mineralogy and Fe/Mn ratio suggest sample is a diogenite.

Specimens: Adrián Contreras Gómez (CRATER meteorites) holds the 1370g main mass. A polished thin section and 42.1 g individual are on deposit at App.

Data from:
  MB111
  Table 0
  Line 0:
State/Prov/County:Gao
Place of purchase:Mauritania
Date:P 2020
Latitude:22º14.6184'N
Longitude:5º59.6502'W
Mass (g):5000
Pieces:many
Class:Diogenite
Shock stage:S3
Weathering grade:low
Ferrosilite (mol%):24.7±0.1
Wollastonite (mol%):1.9±0.0
Magnetic suscept.:3.42
Classifier:A. Love, App
Type spec mass (g):42.1
Type spec location:App
Main mass:Adrián Contreras Gómez (CRATER Meteorites)
Comments:Submitted by Anthony Love
Institutions
   and collections
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. 111, in preparation (2022)
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Geography:

Mali
Coordinates:
     Recommended::   (22° 14' 37"N, 5° 59' 39"W)

Statistics:
     This is 1 of 18 approved meteorites from Gao, Mali (plus 1 unapproved name)
     This is 1 of 79 approved meteorites from Mali (plus 2 unapproved names)
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