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El Atchane 020
Basic information Name: El Atchane 020
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2021
Country: Algeria
Mass:help 600 g
Classification
  history:
Recommended:  CM2    [explanation]

This is 1 of 614 approved meteorites classified as CM2.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), CM chondrites, and CM-CO clan chondrites
Comments: Approved 5 Dec 2021
Writeuphelp
Writeup from MB 110:

El Atchane 020        30°09’21.5’’N, 4°27’19.7’’E

Ouargla, Algeria

Purchased: 2021

Classification: Carbonaceous chondrite (CM2)

History: The meteorite was found in the desert of central Algeria and subsequently purchased by the mass holder.

Physical characteristics: Many small black fragments some of which partly covered with fusion crust.

Petrography: The meteorite is a brecciated carbonaceous chondrite composed of small (apparent mean diameter about 250 μm) chondrules, chondrule pseudomorphs, mineral fragments, and some CAIs set into abundant fine-grained Fe-rich matrix. Some chondrules and CAIs are surrounded by fine-grained dust rims. The matrix contains Fe-sulfides, pyrrhotite, Ti-poor chromite, and some Ca-carbonates. Low analytical totals of matrix analyses suggest the presence of hydrous phyllosilicates.

Geochemistry: Matrix analyses yield FeO=34.2±5.3 wt% and an average total of 79.2±2.2 wt% (5 µm defocused beam, N=9), the latter indicating the presence of hydrous minerals.

Data from:
  MB110
  Table 0
  Line 0:
State/Prov/County:Ouargla
Place of purchase:Algeria
Date:P 2021
Latitude:30°09'21.5''N
Longitude:4°27'19.7''E
Mass (g):600
Pieces:many
Class:CM2
Shock stage:S1
Weathering grade:low
Fayalite (mol%):15.5±18.7 (0.5-61.8, n=33)
Ferrosilite (mol%):1.1±0.8 (0.6-4.2, n=17)
Wollastonite (mol%):1.0±0.4 (0.7-2.7, n=17)
Classifier:A. Greshake, MNB
Type spec mass (g):20.5
Type spec location:MNB
Main mass:Zaid Essibit
Comments:Submitted by Ansgar Greshake
Institutions
   and collections
MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011)
Catalogs:
References: Published in Gattacceca J., McCubbin F.M., Grossman J., Bouvier A., Chabot N.L., D'Orazio M., Goodrich C., Greshake A., Gross J., Komatsu M., Miao B., and Schrader D. (2022) The Meteoritical Bulletin, No. 110. Meteorit. Planet. Sci. 1-4
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Geography:

Algeria
Coordinates:
     Recommended::   (30° 9' 21"N, 4° 27' 20"E)

Statistics:
     This is 1 of 41 approved meteorites from Ouargla, Algeria (plus 1 unapproved name)
     This is 1 of 1232 approved meteorites from Algeria (plus 29 unapproved names) (plus 4 impact craters)
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