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| Chwichiya 003 | |||||||||||||||||||||||||||||||||
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| 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:  32.2 g | ||||||||||||||||||||||||||||||||
| Classification history: |
This is 1 of 26 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 | ||||||||||||||||||||||||||||||||
| Writeup |
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: |
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| 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) |
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| References: | Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150 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:
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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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