Meteoritical Bulletin: Entry for Lahmada 021

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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: 732 g

Classification
history:

Meteoritical Bulletin:	MB 108	(2020)	CO3
Recommended:			CO3 [explanation]

This is 1 of 636 approved meteorites (plus 1 unapproved name) 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

Writeup

help

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 Fa_22.8±21.5, Fa PMD 87% (n=10), Cr₂O₃ in ferroan olivine 0.28±0.11 wt% (n=6). Low-Ca pyroxene Fs_3.1±1.1Wo_1.7±1.6(n=4). Low-Ca pyroxene Fs_9.4±6.9Wo_1.1±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 (2020) Meteorit. Planet. Sci. 55, 1146-1150

Find references in NASA ADS:
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Geography:

Western Sahara

Western Sahara

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

Statistics:
This is 1 of 106 approved meteorites from Saguia el Hamra, Western Sahara (plus 1 unapproved name)
This is 1 of 265 approved meteorites from Western Sahara (plus 20 unapproved names)

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