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Smeïra 001
Basic information Name: Smeïra 001
     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 49.2 g
Classification
  history:
Recommended:  CM2    [explanation]

This is 1 of 602 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 17 Oct 2021
Writeuphelp
Writeup from MB 110:

Smeïra 001        28º40.1429’N, 6º25.9676’W

Tindouf, Algeria

Find: 2020 Oct 8

Classification: Carbonaceous chondrite (CM2)

History: Six small stones weighing a total of 49.24 g were found on October 8, 2020, by Abba Ali while hunting foxes in Hamada Du Draa Desert near the N50 highway in Algeria. These meteorites were sent to Dave Lehman by an associate in Tindouf.

Physical characteristics: Samples have dark gray-dark brown exteriors and are angular in shape. The cut face shows the interior has a chondritic texture composed of sparse chondrules and CAIs set within a dark colored matrix.

Petrography: Description and classification (A. Love, App) Sample has a porous, matrix-dominated (~70 vol%) chondritic texture with dispersed chondrules, isolated mineral grains and CAIs, all of which are mantled by dust rims. Chondrules have an average apparent diameter of 204µm (n=123). Chondrule mesostasis and some phenocrysts have undergone alteration into hydrous mineral phases. Additional minerals: chromite, calcite, Mg-spinel, apatite, troilite, pentlandite.

Geochemistry: (A. Love, App) Olivine Fa12.2±13.7 (Fa0.4-34.5, Cr2O3 in ferroan olivine=0.4±0.1, n=14); low-Ca pyroxene Fs3.8±5.2Wo2.7±2.7 (Fs0.5-12.7Wo0.2-5.6, n=5).

Classification: Carbonaceous chondrite (CM2). Based on textures (dust rims), chondrule size, matrix abundance and mineral compositions, sample is a CM2.

Specimens: Dave Lehman and his partner (NWA Direct) holds the main masses. A polished thin section and a 10 g sliced individual are on deposit at App.

Data from:
  MB110
  Table 0
  Line 0:
State/Prov/County:Tindouf
Date:2020 Oct 8
Latitude:28º40.1429'N
Longitude:6º25.9676'W
Mass (g):49.24
Pieces:6
Class:CM2
Shock stage:low
Weathering grade:low
Fayalite (mol%):12.2±13.7
Ferrosilite (mol%):3.8±5.2
Wollastonite (mol%):2.7±2.7
Magnetic suscept.:3.06
Classifier:A. Love, App
Type spec mass (g):10.0
Type spec location:App
Main mass:Dave Lehman
Finder:Abba Ali
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. 110, in preparation (2021)
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Geography:

Algeria
Coordinates:
     Recommended::   (28° 40' 9"N, 6° 25' 58"W)

Statistics:
     This is 1 of 45 approved meteorites from Tindouf, Algeria (plus 1 impact crater)
     This is 1 of 1154 approved meteorites from Algeria (plus 27 unapproved names) (plus 4 impact craters)
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