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Lahmada 021
Basic information Name: Lahmada 021
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2018
Country: Western Sahara
Mass:help 732 g
Classification
  history:
Recommended:  CO3    [explanation]

This is 1 of 515 approved meteorites classified as CO3.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CM-CO clan chondrites, and CO chondrites
Comments: Approved 3 Aug 2019
Writeuphelp
Writeup from MB 108:

Lahmada 021        27°27’41"N, 9°50’43.2"W

Saguia el Hamra, Western Sahara

Find: 2018 Oct 20

Classification: Carbonaceous chondrite (CO3)

History: Found on October 20, 2018, by Brahim Riguirah and Brahim Oubrik. Bought from Modamed Elguirah in December 2018.

Physical characteristics: Three dark stones without fusion crust

Petrography: (J. Gattacceca, CEREGE) Chondrite with well-defined chondrules (apparent average diameter 180±130 µm, n=36) set in an abundant fine-grained iron-rich matrix (42 vol%). Small CAIs are present. Main opaque mineral is Fe,Ni metal.

Geochemistry: Olivine Fa22.8±21.5, Fa PMD 87% (n=10), Cr2O3 in ferroan olivine 0.28±0.11 wt% (n=6). Low-Ca pyroxene Fs3.1±1.1Wo1.7±1.6 (n=4). Low-Ca pyroxene Fs9.4±6.9Wo1.1±0.7 (n=3).

Classification: Carbonaceous chondrite (CO3). Cr2O3 content of olivine (Grosmann and Brearley, 2005) and high magnetic susceptibility (Rochette et al., 2008) suggest a low petrographic subtype similar to that of Kainsaz.

Specimens: Type specimen at CEREGE. Main mass with Jean Redelsperger.

Bibliography:
  • Grossman J.N. and Brearley A.J. (2005) The onset of metamorphism in ordinary and carbonaceous chondrites. Meteorit. Planet. Sci. 40, 87-122. (link)
  • Rochette P., Gattacceca J., Bonal L., Bourot-Denise M., Chevrier V., Clerc J.-P., Consolmagno G., Folco L., Gounelle M., Kohout T., Pesonen L., Quirico E., Sagnotti L., and Skripnik A. (2008) Magnetic classification of stony meteorites: 2. Non-ordinary chondrites. Meteorit. Planet. Sci. 43, 959–980. (link)
Data from:
  MB108
  Table 0
  Line 0:
State/Prov/County:Saguia el Hamra
Date:2018 Oct 20
Latitude:27°27'41"N
Longitude:9°50'43.2"W
Mass (g):732
Pieces:3
Class:CO3
Weathering grade:strong
Fayalite (mol%):22.8±21.5 (n=10)
Ferrosilite (mol%):3.1±1.1 (n=4)
Wollastonite (mol%):1.7±1.6
Magnetic suscept.:4.82
Classifier:J. Gattacceca, CEREGE
Type spec mass (g):20.7
Type spec location:CEREGE
Main mass:Jean Redelsperger
Comments:work name JR063; submitted by Jérôme Gattacceca
Institutions
   and collections
CEREGE: CEREGE BP 80 Avenue Philibert, Technopole de l'Arbois 13545 Aix-en-Provence Cedex 4 France, France (institutional address; updated 29 Oct 2018)
Catalogs:
References: Published in Meteoritical Bulletin, no. 108, in preparation (2019)
Find references in NASA ADS:
Find references in Google Scholar:
Geography:

Western Sahara
Coordinates:
     Recommended::   (27° 27' 41"N, 9° 50' 43"W)

Statistics:
     This is 1 of 82 approved meteorites from Saguia el Hamra, Western Sahara (plus 1 unapproved name)
     This is 1 of 204 approved meteorites from Western Sahara (plus 20 unapproved names)
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