On Offer: 10.71g specimen of C3.00-ung carbonaceous chondrite crusted fragment, from Western Saha ra.

Official Name: Chwichiya 002

Description: This is a partially crusted 10.71g specimen of Chwichiya 002 C3.00-ung carbonaceous chondrite. The C3.00 ungrouped, is among the rarest and most petrologically pristine of the carbonaceous chondrites. as an "ungrouped" meteorite, it does not fit within any of the existing classification frameworks within the carbonaceous group of chondrites. We know it is a chondrite. We know it is a carbonaceous chondrite, hence the "C" part of the classification. We know it has not been altered in any appreciable way by heat or water, hence the very rare "3.00" petrologic grade designation. We know this meteorite has remained relatively unchanged since it was formed at the very beginning of our Solar System some 4.571 billion year ago. We know all of this, but we dont know where it comes from or exactly where it fits within the taxonomy of the other carbonaceous chondrites. It is unlike any of the other carbonaceous chondrites. The ratios of the stable oxygen isotopes in this meteorite tell us it comes from an unknown parent body, with a different origin than any of the other carbonaceous chondrites. A truly extraordinary meteorite with great significance to science.

We offer a 20% institutional research and educational discount on all of our meteorite specimens. We also have a specimen donation program available for institutions with limited research budgets willing to site us in their research papers as source of the research specimens.

Type: C3.00-ung Carbonaceous Chondrite Meteorite

What you get: 10.71 gram Chwichiya 002 C3.00-ung carbonaceous chondrite crusted fragment Meteorite Specimen as shown, Membrane Storage/Display Box, and signed Certificate of Authenticity.

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Chwichiya 002Basic informationName: Chwichiya 002
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: 644 g
Classification
history:Recommended: C3.00-ung [explanation]
This is 1 of 3 approved meteorites classified as C3.00-ung. [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), and Ungrouped chondrites
Comments:Approved 17 Feb 2020Writeup
Writeup from MB 109:

Chwichiya 002 27 06 45.02"N, 11 10 25.2"W

Saguia el Hamra, Western Sahara

Find: 2018 Jun 10

Classification: Carbonaceous chondrite (C3.00, ungrouped)

History: Found close to Houza village by Elho Sbiti on June 10, 2018. Bought from Mohamed Elguirad in Guelmim in June and October 2018. More samples bought from Mohamed Elguirah, Habib-Naji Naji and Youssef Ait El Caid in January 2019. Some material bought by Nourddine Azelmat.

Physical characteristics: Fragments and crusted stones, including a 158 g full stone. Cut surface reveals a dark porous interior with chondrules.

Petrography: (J. Gattacceca, CEREGE) Chondrite with well-defined chondrules (average apparent diameter 480 300 m, n=29) set in an abundant fine-grained iron-rich matrix (74 vol%, by point counting, n=371). Opaques are troilite, magnetite, rare metal (as inclusion in silicates and in the matrix). 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. In contrast to type 2 chondrites, IR transmission spectroscopy (L. Bonal, IPAG) on matrix grains only reveal a faint water and Si-O-band (attributable to phyllosilicates), reflecting a very low extent of aqueous alteration. Based on the structural order of the polyaromatic matter assessed by Raman spectroscopy (L. Bonal, IPAG), this meteorite appears to be less heated than the least heated type 3 ordinary chondrite, Semarkona.

Geochemistry: Olivine Fa 37.6 16.7, range Fa 1.2-46.5 (n=16), Cr 2O 3 in ferroan olivine 0.39 0.12 wt% (n=11). Low-Ca pyroxene Fs 3.1 3.0Wo 0.8 0.3 (n=4). Defocussed (10 m) microprobe totals in the matrix 90.9 1.2% (n=11). Oxygen isotopic composition (J. Gattacceca, C. Sonzogni, CEREGE) from analysis of one acid-washed 1.5 mg aliquot of a powdered 38 mg bulk sample is 17O=0.42 , 18O=8.23 , 17O=-3.88 (linearized, slope 0.5247, analytical uncertainties 0.08 , 0.12 , 0.03 respectively).

Classification: Carbonaceous chondrite (C3.00-ungrouped). This meteorite is distinct from CM2 chondrites for its larger chondrule size and only incipient aqueous alteration. Type 3.00 is based on the non-detection of phyllosilicates by XRD and microprobe total in the matrix higher than usually measured in type 2 chondrites (see e.g., Ebert et al. 2019, MAPS doi:10.1111/maps.13212), and Raman spectroscopy. Possibly paired with NWA 12957 and NWA 11750 despite having distinct oxygen isotopic composition.

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

Data from:
MB109
Table 0
Line 0:State/Prov/County:Saguia el HamraPlace of purchase:GuelmimDate:2018 Jun 10Latitude:27 0645.02"NLongitude:11 1025.2"WMass (g):644Pieces:manyClass:C3.00-ungWeathering grade:moderateFayalite (mol%):37.6 16.7 (n=16)Ferrosilite (mol%):3.1 3.0 (n=4)Wollastonite (mol%):0.8 0.3Magnetic suscept.:4.38Classifier:J. Gattacceca, L. Kr mer Ruggiu, CEREGE; L. Bonal, IPAGType spec mass (g):39.2Type spec location:CEREGEMain mass:Jean Redelsperger, Nourddine AzelmatFinder:Elho SbitiComments:work name JR058/NA006-SP6; submitted by J r me Gattacceca
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Product Attributes:

Country/Region Of Manufacture: Unknown

New Fall: Fresh crust

Weight (lbs.): 0.50 lb

Length (in.): 12

Width (in.): 10

Height (in.): 3