File:Park Forest Meteorite fusion crust.jpg
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| Description |
Park Forest Meteorite (large individual with dark fusion crust) - the only rock from space to impact in a modern urban area is the Park Forest Meteorite. It arrived on 26 March 2003 in the suburbs of Chicago, northeastern Illinois, USA. The original rock is estimated to have been the size of a small car before fragmentation. Its entry into Earth’s atmosphere was marked by a noticeable fireball seen by many people in Ohio, Indiana, Wisconsin, and Illinois. The fireball & impact was captured by police cruiser videos. Meteorite collectors descended en masse to the suburb of Park Forest & surrounding areas. Many large pieces ended up in the Field Museum of Natural History’s collections (downtown Chicago), where several are on public display. The Park Forest Meteorite has been classified as a brecciated L5 chondrite (“L” means low total iron content; “5” refers to a recrystallized chondritic rock, such that most of the chondrules are indiscernible). It consists of light-colored clasts in a dark matrix. The rock has been strongly shock metamorphosed some time in its history. Mineralogical analysis shows it is composed of olivine, pyroxene, troilite, maskelynite (= plagioclase feldspar glass), iron-nickel alloy, chromite, etc. Dating of shock-metamorphosed L5 chondrites indicates that the parent body in the asteroid belt broke apart during the Middle Ordovician, about 465 million years ago. Fragments of the busted-up L5 chondrite parent body are now represented by the Flora family of stony asteroids. |
| Date | |
| Source | Ordinary chondrite (Park Forest Meteorite) 1 |
| Author | James St. John |
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This image was originally posted to Flickr by jsj1771 at https://www.flickr.com/photos/47445767@N05/14777587631. It was reviewed on 30 July 2014 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| current | 05:01, 30 July 2014 | | 1,539 × 1,300 (701 KB) | Tillman (talk | contribs) | Transferred from Flickr via Flickr2commons |
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