File:Carbonaceous chondrite (Allende Meteorite) (4.560-4.568 Ga) 8.jpg
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Summary
[edit]DescriptionCarbonaceous chondrite (Allende Meteorite) (4.560-4.568 Ga) 8.jpg |
English: Carbonaceous chondrite - slice of the Allende Meteorite from Mexico. (~7.9 centimeters across at its widest)
Carbonaceous chondrites are dark gray to blackish-colored chondrite meteorites with a relatively carbon-rich matrix. The first large sampling of carbonaceous chondrites available to meteoriticists came with the 1969 fall of the Allende Meteorite. Before Allende, carbonaceous chondrite material was exceedingly rare. Allende has become the most heavily studied and the most famous carbonaceous chondrite. Allende impacted on Earth at 1:05 AM on 8 February 1969. Its known strewn field trends southwest-to-northeast in the vicinity of the town of Allende in southeastern Chihuahua State, northern Mexico. The cut slice seen here displays the internal structure & composition of the Allende carbonaceous chondrite. Allende has small, spherical to subspherical structures called chondrules (all chondrites have these). Allende also contains whitish, irregularly-shaped patches called CAIs (“calcium-aluminum inclusions”), composed of high-temperature Ca-Al-Ti silicate and oxide minerals. The blackish, fine-grained, carbon-rich matrix consists of Fe-olivine and poorly graphitized carbon. A few tiny specks of metallic iron-nickel alloy also occur. Allende rocks represent the near-oldest meteoritic material known. The olivine chondrules in Allende rocks date to 4.560 billion years. The CAIs in Allende rocks date to 4.568 billion years. |
Date | |
Source | https://www.flickr.com/photos/47445767@N05/50885306888/ |
Author | James St. John |
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/50885306888. It was reviewed on 2 February 2021 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
2 February 2021
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current | 16:33, 2 February 2021 | 3,811 × 2,597 (10.4 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/50885306888/ with UploadWizard |
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Width | 4,061 px |
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Height | 2,815 px |
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Pixel composition | RGB |
Orientation | Normal |
Number of components | 3 |
Horizontal resolution | 1,200 dpi |
Vertical resolution | 1,200 dpi |
Software used | Adobe Photoshop Elements 18.0 (Macintosh) |
File change date and time | 14:24, 29 January 2021 |
Exif version | 2.31 |
Color space | sRGB |
Unique ID of original document | B06D30308B7E7E4E746EE829D044C3F2 |
Date and time of digitizing | 12:30, 28 January 2021 |
Date metadata was last modified | 09:24, 29 January 2021 |