File:Allende meteorite, carbonaceous chondrite (14787764392).jpg
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Allende meteorite, 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 silicates & oxides. The blackish, fine-grained, carbon-rich matrix consists of Fe-olivine & 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 | Carbonaceous chondrite (Allende Meteorite) (4.560-4.568 Ga) 2 |
| Author | James St. John |
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This image was originally posted to Flickr by jsj1771 at https://www.flickr.com/photos/47445767@N05/14787764392. It was reviewed on 15 August 2014 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| current | 14:45, 15 August 2014 | | 2,285 × 1,777 (3.25 MB) | Basilicofresco (talk | contribs) | Transferred from Flickr via Flickr2commons |
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