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Chwichiya 003
Basic information Name: Chwichiya 003
     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 32.2 g
Classification
  history:
Meteoritical Bulletin:  MB 108  (2020)  CM2
Recommended:  C3-ung    [explanation]

This is 1 of 22 approved meteorites classified as C3-ung.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), and Ungrouped chondrites
Comments: Approved 15 May 2019
Revised 18 Jul 2021: reclassified
Writeuphelp
Writeup from MB 108:

Chwichiya 003        27°05’26"N, 11°10’12"W

Saguia el Hamra, Western Sahara

Find: 2018 Dec

Classification: Carbonaceous chondrite (CM2)

Physical characteristics: Many dark, irregular fragments. Cut surface reveals a dark interior.

Petrography: (J. Gattacceca, CEREGE) Chondrite with small chondrules (average apparent size about 250 µm) set in an abundant (79 vol% by point counting) fine-grained iron-rich matrix containg phyllosilicates and carbonates. Opaque minerals are FeS, magnetite, rare metal.

Geochemistry: Olivine Fa23.0±24.1, range Fa0.9-54.1 (n=11). Low-ca pyroxene Fs2.1±1.2Wo1.0±0.3 (n=4). Defocused (10 µm) microprobe total in the matrix is 87.7±2.4 (n=9).

Classification: Carbonaceous chondrite (CM2).

Specimens: Type specimen at CEREGE. Main mass with Pierre-Marie Pelé


Writeup from MB 110:

Chwichiya 003 (reclassification)

Petrography: (J. Gattacceca, CEREGE)  XRD over a ~1 cm2 area on a polished section (D. Borschnek, CEREGE) does not reveal the presence of hydrous phases (serpentine, tochilinite) typically observed in type 2 chondrites using the same experimental setup.

Geochemistry: Oxygen isotopic composition (J. Gattacceca, C. Sonzogni, CEREGE) from analysis of one 1.5 mg aliquot of a powdered 208 mg bulk sample is δ17O=-2.47‰, δ18O=3.63‰ , Δ17O=-4.36‰ (slope 0.52, analytical uncertainties 0.08‰, 0.12‰, 0.01‰ respectively).

Classification: Carbonaceous chondrite (C3-ung). The petrography is similar to CM chondrites, but there is no evidence for significant aqueous alteration (XRD, and elevated total in the matrix analyses compared to CM2 chondrites, as reported in Met. Bull. 108). Oxygen isotopic composition is at the limit between the CO and CM fields.

Data from:
  MB108
  Table 0
  Line 0:
State/Prov/County:Saguia el Hamra
Date:2018 Dec
Latitude:27°05'26"N
Longitude:11°10'12"W
Mass (g):32.16
Pieces:many
Class:CM2
Fayalite (mol%):23.0±24.1 (n=11)
Ferrosilite (mol%):2.1±1.2 (n=4)
Wollastonite (mol%):1.0±0.3
Magnetic suscept.:4.35
Classifier:J. Gattacceca, CEREGE
Type spec mass (g):6.83
Type spec location:CEREGE
Main mass:Pierre-Marie Pelé
Comments:work name PM19C1; submitted by Jérôme Gattacceca
Plots: O isotopes:  
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
Published in Meteoritical Bulletin, no. 110, in preparation (2021)
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Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Christophe PICQ      
Geography:

Western Sahara
Coordinates:
     Recommended::   (27° 5' 26"N, 11° 10' 12"W)

Statistics:
     This is 1 of 97 approved meteorites from Saguia el Hamra, Western Sahara
     This is 1 of 240 approved meteorites from Western Sahara (plus 19 unapproved names)
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